We designed and deployed a novel compact Raman spectrometer to discriminate between original and imitation whisky, with ethanol concentrations measured to within 2% accuracy. This work has application potential in the liquor industry.
We present a laser-cooled rubidium focussed ion beam for use in nano-fabrication and imaging. We aim to achieve higher beam brightness and smaller focus spot sizes than gallium focussed ion beams.
We carry out a comprehensive survey of ab initio methods to predict the electronic band structure of Ag, graphene, and FeSe, and compare the results with ARPES data.
We theoretically investigate the performance of an interaction-driven many-body quantum heat engine with a working medium consisting of an experimentally realisable, harmonically trapped one-dimensional Bose gas, exploring the entire phase diagram.
A novel energy-efficient and high-performance MEMS-based mechanical switching structure with a suspended waveguide is investigated for developing the applications of high-speed optical communication networks, hyper-scale datacenter and data-intensive computing systems.
2D antimony doped indium oxide (IAO) nanosheets with few atom thicknesses have been synthesized utilizing liquid metal printing technique. The work proposes a viable pathway for realizing ultrathin transparent semiconducting oxides (TSOs) with enhanced electronic and optical properties.
This work focuses on the performance of different classical optimizers when used in variational quantum algorithms, specifically for applications in quantum chemistry, for example, evaluating the ground state energy, the dissociation energy, and the dipole moment of different molecules.
We have established a new Australian research laboratory dedicated for studies of gravitationally bouncing droplets of fluid. In this inaugural work we have created and observed long-lived and interacting time crystals.
In this work we present a unifying theory based on Green's function that realistically model waveguides talking into accounting finite size and boundaries. We then apply our formalism to experimentally study Atom-Photon Bound states in a rectangular waveguide QED system.
Quantum cascade lasers emitting frequency combs are of interest due to the variety of novel applications they could support. Here we present a numerical study about the self-generation of these combs in the terahertz region.
Measurement based quantum computing is an alternate formulation of quantum computing to the ubiquitous circuit model. Here we demonstrate how to generate algorithm specific graph states to implement arbitrary quantum circuits in this model.
Nonlinear properties of optical fibers are parasitic at high optical powers and can be manipulated by tuning the composition of the fiber core via the molten core method (MCM) for fiber fabrication.
At the TeV scale, low-energy precision observations of neutron characteristics provide unique probes of novel physics. Precision studies of neutron decay observables are susceptible to beyond the Standard Model (BSM) tensor and scalar interactions, while the neutron electric dipole moment, $d_n$, also has high sensitivity to new BSM CP-violating interactions. To fully utilise the potential of...
The molecular convergent close-coupling (MCCC) method is used to perform calculations of 10–1000 eV electrons scattering on the electronic and vibrational ground state of HeH+. Cross sections are presented for excitation of the n=2–3 singlet and triplet states and ionization.
We apply the coupled-mode theory to study the steady state of BECs loaded into the p-band of a 2D bipartite optical lattice potential. We demonstrate the possibility to create a superposition of Bloch states with a nontrivial orbital texture.
We characterise the emergence of vortex pairs in stationary solutions of superfluid flow past a finite obstacle, both analytically and numerically. We demonstrate how this leads to the breakdown of superfluidity at the critical velocity.
The relativistic convergent close-coupling method was applied to calculate a comprehensive collision dataset for electron scattering from atomic tin. Elastic, excitation and ionisation cross sections are presented for the ground and low-lying excited states.
In this work, DFT analysis is employed to study the structural evolution of ternary III-oxides, such as (InxAl1-x)2O3, (AlyGa1-y)2O3, and (GazIn1-z)2O3, determining the compositions at which phase transitions occur and important physical parameters.
Some new developments and lessons learned in the automated calibration system for the Belle II experiment over the past two years.
This work explores the potential of convolutional neural network to directly decode information encoded in the nonlinear Fourier domain under the influence of carrier frequency offset and carrier phase offset.
Determination of transition polarisability for atomic parity violation in cesium.
We present a novel design of optical phantom using metal-ion doped glass-ceramics. Comprising crystalline structure and nickel ion in the glass matrix, this glass-based optical phantom can mimic the optical properties of human tissues with excellent optical homogeneity and stability.
We present a topology-optimised metasurface design for ultra-compact and light-weight space-based polarimetry, allowing for five parallel polarisation measurements across the moving image strip, to facilitate applications including water glint removal.
Results from the Koala, Taipan and Sika instruments at the OPAL reactor, ANSTO, reveal two martensitic transformations for an Fe-30at%Pd crystal between 400 to 100K. These results will be discussed in this poster presentation.
We motivate a dark matter model correction, due to the sun's gravity, in which direct detection experiments are expected to exhibit a non-sinusoidal signal. We also explore the dark sector consisting of more than one distinct mass component.
A high $Q$-factor whispering-gallery mode resonator was fabricated of yttrium lithium fluoride, furthermore an independent measurement of the coupler separation distance was explored for beam alignment and in probing the evanescent field between our couplers.
We model the dynamics of nanomechanical oscillator coupled to single electron transistor using the nonlinear Fokker-Planck equation in the regime where transport is fast compared to mechanical dynamics. The calculations are compared with recent experimental results.
We study the effect of the inorganic semiconductor substrate on the exciton binding energies in the crystalline tetracene and its implications for the singlet fission effect.
We show a theoretical analysis of second-order nonlinearity in unpoled SiN strip-loaded LNOI waveguides with bound states in the continuum predicting a conversion efficiency of 1000% W-1 cm-2.
We present our recent results on the electrical detection of coherent spin manipulation of spin-dependent recombination in a silicon carbide pn-junction device at room temperature via pulsed electrically detected magnetic resonance.
We use dynamical mean-field theory in conjunction with density functional theory and time-dependent Ginzburg-Landau formalism to investigate the electronic properties of the charge density wave (CDW) material 1T-TiSe$_{2}$ to better understand the formation and melting of the CDW state.
We present a powerful theoretical framework, organized as user-friendly open-source tool, for exploring image formation in confocal microscopes when using non-linear fluorophores. It allows extremely convenient image optimization and enables the unraveling and exploration of unexpected and exotic imaging phenomena.
Using a superfluid helium third-sound resonator, we engineer the dynamical backaction from entropic forces, applying it to achieve optomechanical phonon lasing with a threshold power of only 2 picowatts, a factor of 2000 lower than has been shown before.
We use polarisation resolved photoluminescence to reveal enhanced valley polarisation of excitons on a ferromagnetic substrate. This indicates energetic splitting of the valleys induced by the magnetic field and potential magnetic exchange interactions.
Gold and Silver Nanoparticles and N-Graphene Quantum Dots (N-GQDs) were used for NELIBS. 199% and 208% of signal improvements were reached with Au and Ag nanoparticles. In N-GQDs case, 79% of signal improvement was reached.
We propose the use of charged, massive particle interferometers to probe for new or modifications to known forces at close range. We consider such a devices ability to detect Yukawa style modifications to gravity and the electromagnetic interactions.
Recent measurements of W mass and muon gyromagnetic anomaly disagree with the Standard Model. Both are reconciled by a preon model, with tension under 0.5 sigma and first-principles prediction of W and Z masses.
Exciton dynamics in organic semiconductors, such exciton transport and spin-mediated spectral conversion. Theoretical modelling and experimental interpretation using Markovian and non-Markovian quantum master equations. Dynamics, Steady-state solution and departure from Markovianity.
Stiblaistion of metal clusters in the surface by adding an overlayer of metal oxide using ALD, it is expected to prevent the agglomeration and stabilise metal clusters on the surface for applications in catalysis, photocatalysis, medical devices, and sensors.
See attached word document
In this work, we explore better ways to fabricate superconducting nanometre-thick high-fluence indium and gallium implanted SOI films. We provide structural and electrical measurements of these devices in preparation for fabricating patterned devices which may be used for quantum technologies.
A pressure-sensitive microstructured optical multimode fibre is used to build a hydrophone using a homodyne detection configuration. The fibre hydrophone is tested again a commercial piezo-electric hydrophone and shows similar performance across the whole audio frequency band.
The DFSZ axion, which solves the Strong CP problem, suffers from a cosmological domain wall problem. In this talk, I provide a catalogue of domain-wall-free DFSZ-like axion models by modifying the structure of the Yukawa couplings based on symmetry principles
We want to analyse the fluctuation theorem in the context of a two-dimensional vortex matter system.
Reporting on the development of next-generation guide star laser technology using diamond Raman laser that aims to increase power, provides frequency stabilization, and narrow laser linewidth required for guide star applications.
The ITER and JET fusion reactors use beryllium-containing materials in plasma facing wall components. We calculate integrated total and state-selective electron-capture cross sections for Be$^{4+}$ collisions with excited states of atomic hydrogen using the wave-packet convergent close-coupling method.
We develop a radar scattering theory for time-varying surfaces with anisotropic dispersion relations, and apply it to the problem of remote sensing of flows generated by internal gravity waves in the ocean.
We demonstrate laser Doppler velocimetry to a moving airborne drone at a distance of 600 m, achieving an in-line velocity precision of 2 nm/s with 10 seconds of averaging.
We present a new approach to analysing homodyne measurement using Schrödinger-cat states as local-oscillators and give the characteristics of this type of measurement for various different input states.
In this work we obtain images using an Optical Laser Scanning system. Scanning is performed with a laser beam (375 nm) through a 100X microscope objective, the sample is in an XY translation stage (~ 20 nm by step).
The processing of UV curable resin for manufacturing 3D fibre preforms based on DLP technology has been investigated. Fibre preforms with higher silica loading have been successfully fabricated.
We propose a new measure of information flow in non-unitary quantum cellular automata which defines an equivalence class of open quantum systems that are coupled to an environment and are invariant in time and space.
We characterise near-IR to telecom frequency conversion via four-wave mixing in a rubidium-filled hollow-core fibre to allow for information transfer between efficient quantum memories within a fibre-based quantum network.
Modern surface micromachined optical MEMS commonly use electrostatic means to achieve mechanical actuation and often require a closed feedback loop to maximize tuning accuracy. Our method enables MEMS membrane displacement measurement without device modifications.
NMI participates in international inter-laboratory comparisons (ILCs) supporting development of standards for graphene and 2D materials. This presentation highlights the technical challenges of the accurate measurement and characterisation of these materials with Atomic Force Microscopy.
We report the investigation of extrusion die and glass billet parameters on the loss of tellurite fibre. The billet surface quality was found to be critical to achieve low fibre loss.
We present ‘tilt locking’ as a potential candidate for laser stabilisation for space applications and demonstrate the performance at stabilization limits near the standard RF approaches.
In the context of Distributed Quantum Computing,this work demonstrates the impediments on the usage of satellites for distributing entanglement between two error-corrected quantum computers on earth separated by varying distances.
Recent developments in several fields require high power narrow linewidth lasers. Here, we measure the linewidth of a high power, single frequency DRL. We furthermore propose as a novel static frequency control mechanism, with speeds comparable to piezo-electric devices.
One key challenge in the search for new Topological Insulators (TI) is their characterization. Through theoretical modelling, we identify a method to improve the magnetic monopole response of TI which can be used to rapidly characterize the properties of TIs.
This analysis uses the Belle dataset consisting of $620\times10^6$ B meson pairs and includes a first measurement of the branching fraction and helicity angle asymmetry of $B^0\to D^-\pi^+\pi^0$ as well as an update to the branching fraction of $B^0\to D^-\rho^+$.
We demonstrate the use of a ring-shaped Bose-Einstein condensate as a rotation sensor by measuring the interference between two counter-propagating phonon modes.
Micro Electro-Mechanical Systems (MEMS) based Fabry Perot interferometers offer low size, weight, and power (SWaP) platforms for carrying out spectroscopic and chemical/biological sensing while being mechanically robust and field-portable unlike traditional bulk-optics based techniques.
We use an improved numerical model to demonstrate the advantages in terms of increased average power and spectral broadening while generating a supercontinuum using a nonlinear amplifier over the traditional method of using an amplified pulse seeding a passive fibre.
The molecular convergent close coupling method was applied to study the ionisation of molecular hydrogen and its isotopologues from various electronic states. Vibrationally-resolved cross sections are presented and compared with data from literature.
Our project demonstrates two types of monolithic SiC metalenses, a Conventional one and an extended focal length one, to capture light from quantum emitters embedded close to the surfaces of the monocrystalline SiC material.
We present the first, to our knowledge, Monte Carlo model of Raman scattering in the water column under pulsed laser excitation, and will compare and contrast the characteristics of elastic and Raman returns.
We demonstrate a hybrid quantum-semiclassical multi-scale modeling approach to characterize degenerately phosphorus-doped in-plane contacts and their impact on the energy states of the precision placed donor quantum dots under different bias conditions in silicon STM devices.
Presented is the concept of creating inertial force by the field theory. Provided is the candidate equation that describes inertial force by that field and the experiment that can test the new concept
We report results for the transcorrelated method applied to multicomponent quantum gases. We discuss applications of our methods to few atom systems that are achievable in experimental setups, as well as to liquid droplets and heavy impurities in quantum gases.
We perform fully non-linear simulations of cosmological weak gravitational lensing and extract observables that will be probed by the next generation of large scale structure surveys.
We develop a non-perturbative description of spontaneous parametric down-conversion in the high-gain regime for nanostructured systems with arbitrary amounts of loss and arbitrary dispersion. As an example, we use it numerically to investigate integrated quantum spectroscopy at high gain.
The detection of kilohertz-band gravitational waves promises discoveries in astrophysics, exotic matter, and cosmology. We study how to theoretically improve future interferometric gravitational-wave detectors' kilohertz-band sensitivity which is limited by quantum noise.
Demonstration of a novel multi-pass approach to ultra-fast laser inscribed waveguide fabrication, which improves optical mode confinement and reduces bend losses for small radii of curvature, enabling more compact photonic integrated circuits and greater integration density.
This work studies the phase and structural evolution of Yb-doped alkaline earth fluoride nanoparticles in silica-based optical fiber during thermal treatments in fiber fabrication. This knowledge will aid in understanding and tailoring the optical properties in the resultant fibers.
We study the query complexity of determining if a graph is connected with global queries. By following the template of l0-samplers, we construct quantum algorithms solving graph connectivity in several global query models.
We employ high quality-factor nano resonators coated with metal-organic frameworks to obtain high sensitivity and selectivity towards a specific VOC. In this work, we have demonstrated a LOD of 400 ppm in ambient conditions which aids to test hyperglycaemic condition.
Phase cameras are wavefront sensors which measure the transverse amplitude and phase of specific frequency components of optical fields. In this presentation we discuss a new all optical phase camera design and give an overview of previous and ongoing applications.
We develop optimal measurement and control strategies for spectator-qubits(SQ) to mitigate data-qubit dephasing caused by a random telegraph process. Our findings show that the SQ, like Dynamical Decoupling and Quantum Error Correction, may effectively increase the coherence of the data-qubit.
2P:1P multidonor quantum dot EDSR qubit model, optimizing spin rotation and coherence. The model accounts for complete understanding of what impact qubit geometry and nearby charge defects have on the electrical operation and noise properties.
New insight into the quark mass dependence of octet baryon magnetic polarisabilities is created by confronting lattice QCD with a constituent quark model description of fractionally charged baryons where individual quark sector contributions are isolated.
A 215 mW single-frequency thulium-doped ring-cavity fiber laser operating at 2050 nm based on Tm/Ho-codoped fiber saturable absorber has been proposed and experimentally demonstrated for the first time.
We show how one can use phase-space represenations of quantum mechanics to compare theoretical and experimental outputs of linear bosonic networks. These methods are applied to data from recent large scale experiments of a Gaussian Boson Sampling quantum computer.
We have investigated the preferential coupling of the nanodiamond into the guided-modes of a step-index fibre. To explore the possibility of long-distance magnetic field sensing we have also modelled the coupling efficiency of splicing diamond-doped fibres to commercial SMF-28e fibres.
Quantum approaches to the binary paint shop problem – an optimisation challenge in the automotive industry – are investigated. We benchmark the quantum approximate optimisation algorithm and its recursive variant against classical heuristics and exact solvers
Here we describe our work on the development of a precision vector quantum diamond magnetometer (QDM). We will also discuss future opportunities for engineering quantum-grade diamond materials for precision magnetometry applications here in Australia.
Quantum Machine Learning is an exciting prospect emerging from the recent advances in Quantum Computing. The ability to derive a quantum advantage over classical algorithms is paramount and this paper explores methods based on quantum kernels to realise this advantage.
Measurement and control of massive mechanical oscillators in the quantum regime is now possible [Nature 556, 478 (2018); Science 372, 625 (2021)]. I will describe this work and the possibilities it enables for sensing with non-classical mechanical systems moving forwards.
We present a quantum theory of a one dimensional optically levitated mirror. We consider the resulting entanglement between the mirror and cavity field and squeezing in the mirror output. We consider the visibility of this entanglement and thermal effects.
We investigate a scheme for microwave-to-optical transduction using atomic three-level systems. Using quasi-degenerate perturbation theory we derive an effective Hamiltonian description for the conversion process. We find that the conversion is limited by off-resonant effects like unintended biphoton emission.
In this work we study quench dynamics within the extended Su-Schrieffer-Heeger model. Specifically we consider the question if there is a quench between two topological states does the "path" of the quench impact the survival of the initial state.
We consider harmonically trapped systems of two and three bodies interacting via a contact interaction and present semi-analytic calculations of time-dependent observables, Ramsey signal and particle separation, following a quench in s-wave scattering length.
A brief survey of recent B-physics studies with the ATLAS detector at the LHC, concentrating on tests of the standard model of particle physics.
Reconstruction techniques with the aid of ray tracing are investigated for a custom-built OPT system operated without applying index matching material to strongly refracting objects.
Here we report the research of real-time fluorescence monitoring during the creation of NV color centers in diamond using a femtosecond laser.
In quantum metrology in the presence of noise, we show that using multi axis control leads to better than SQL scaling, and can even recover Heisenberg scaling under appropriate conditions.
High temperature sustainability of a new class of Bragg gratings referred to as regenerated polymer optical fiber Bragg gratings (RPOFBGs) in ZEONEX-based polymeric fibers are explored and integrated with cochlear implants to aid surgical navigation.
We demonstrated of a multimode fibre specklegram sensor for noninvasive respiratory rate monitoring on a hospital mattress using deep learning.
We theoretically investigate the wavepacket dynamics in a non-Hermitian, optically anisotropic exciton-polariton system and observe their self-acceleration. We also describe the formation of pseudospin topological defects in momentum space.
This study analyses the temperature-dependent spin and optical properties of hexagonal boron nitride (hBN) nanopowders, which show a complex profile in optically detected magnetic resonance (ODMR) that may be exploited as a sensitive temperature sensor.
We use static and time-dependent mean-field approaches to investigate and compare the shell effects affecting fragment formation in both fission and quasifission.
The project is regarding the mapping silicon test mass birefringence using an automated system. The measurement is based on a polarization modulation technique using a PEM. Our system can measure small Birefriengence of 10^-9.
Detection of simulated failures in underground power cables using Multimode fibers. Failure in underground power cable couases overheat (hot-spot), and locating the problem is difficult. Detection is achieved through Distributed Temperature Sensors that use RAMAN-based measurements for high-precision temperature detection.
The High-Luminosity Large Hadron Collider is due to come online sometime in 2028, posing new challenges to the ATLAS detector. The new Inner Tracker is simulated to check hardware and software expectations are met and understood.
To observe Maxwell’s demon in our trapped Yb ion proof-of-concept experiment, a high finesse, high absolute transmission efficiency Fabry-Perot optical cavity is being developed to resolve < MHz scale shifts of single photons.
Third (THG) and one-third harmonic generation (OTHG) have not been used practically despite their unique potential for various applications due to challenging phase matching conditions. Here we propose a stepladder scheme allowing efficient THG and OTHG from spontaneous processes.
The study theoretically investigates outer valence molecular orbitals in the isomerization of of norbornadiene and quadricyclane. Through space interaction of NBD is confirmed as the next highest occupied molecular orbital (10a1) of NDB.
I will describe a bifurcating entanglement renomalization group flow that is based on the critical (1+ 1) D Ising model and go on to show that this defines a tensor network state with some unusual correlation function behaviour.
We investigate wavefront shaping in a multi-mode fibre amplifier to achieve simultaneous suppression of SBS while maintaining a high output beam quality
We use symmetry analysis of metasurfaces on thin film to determine the vector field profiles of the modes and thus calculate coupling to radiation channels, mode overlaps and the nonlinear polarisation of sum frequency generation.
We study how impurity atoms can be trapped within superfluid vortices in a two-component BEC. This leads to distorted vortex profiles and a mass-dependent splitting of the impurities energy. The excited states of the impurity show effects analogous to chemistry.
The System for Toxic Element Analysis (STELA) is a new novel instrument designed for the measurement of toxic elements at significantly improved detection limits using highly advanced X-ray optics in conjunction with X-ray fluorescence analysis.
Taipan is the highest flux, thermal neutron scattering instrument at ANSTO, Australia. This poster will present some recent scientific highlights at Taipan – both as a triple axis spectrometer, and a Be-filter analyser spectrometer.
Preliminary results on the generation of hydrogen and methane from Australian wheat straw.
In this work we present our all-fiber fanout technology and the results of its evaluation. The broadband, low-loss components were tested for optical, environmental and mechanical performance showing high maturity and readiness for field deployments.
The newly developed tensor e-graph optimisation technique provides an efficient approach to compute correlation functions of multi-hadron states in lattice QCD. Benchmarks of numerical performance are presented for tensor e-graph optimisation applied to correlation functions for interpolating operators of nuclei.
We study steerabilities of various $n$-party 2-producible entangled states. Most strikingly, a state produced from a single 2-qubit state allows one party shared a qubit from entangled state to steer any one of the n-1 otherparties for arbitrarily large $n$.
We present a novel atom interferometry scheme that allows readout-delay-free measurement by extracting phase information from overlapped spatial fringes to measure gravity on compact devices using Bragg pulses.
We introduce a semi-empirical microscopic model of spin crossover materials combining crystal field theory with elastic intermolecular interactions. We investigate the interplay of single site and collective physics of SCO materials. We demonstrate a realistic route to room temperature switching.
This work presents a surface micromachined long-wave infrared tunable Fabry–Pérot interferometer (FPI) incorporating Ge/BaF2/Ge solid-material distributed Bragg’s reflectors (DBRs) for 8–10 µm optical wavelength range. This work also represents a reliable and reproducible fabrication process for tunable cavity LWIR FPIs.
The optical and chemical properties of the magnetic nanofluid can be altered using a magnetic field. The magnetic nanofluid shows tunability in the diffraction angle under a magnetic field. Hence, magnetic nanofluid is the potential candidate to prepare soft grating.
We present a quantitative comparison of algorithms commonly supplied with time tagging hardware, as well as more sophisticated algorithms presented in the literature. It is apparent that different signal-to-noise ratios and measurement efficiencies can be achieved through these different algorithms.
The self-terminated, layered structure of van der Waals materials introduces fundamental advantages for IR optoelectronic devices. We introduce a new van der Waals material candidate, zirconium germanium telluride (ZrGeTe4), to a growing family of promising IR van der Waals materials.
The paper reports an experimental method to visualize glass flow through an extrusion die. A soda-lime glass was used as the model glass for the visualization. The initial work used simple die designs to refine existing theoretical models.
Through the use of the flux-assisted molten core method, semiconductor core fibers (GaAs and ZnSe), that cannot be directly melted at ambient pressure due to intrinsic volatility have been fabricated into meters of fiber.
Manganese characteristic X-ray spectra have been measured at the Diamond Light Source Synchrotron (U.K.) and compared with relativistic quantum theory.
Membership trends and related statistics of the Australian Institute of Physics over the 60 years since its establishment in 1963 are presented. Its Members have had distinguished careers in universities, research organisations or industry.
We present our experimental realisation of a degenerate mixture of $^4$He [bosonic] and $^3$He [fermionic], with $^4$He $T/T_C\sim0.3$, and $^3$He $T/T_F\sim0.1$, in the metastable state $2^3S_1$. The large internal energy of the metasable state allows for far-field single-particle 3D reconstruction.
We have simulated a microspectrometer system that utilises a BIC transmission filter array with a photodetector array and have used it to identify common acyclic hydrocarbons down to 50 ppm concentrations via a machine learning classifier.
We present a new parameter s_∗, determined by Hamiltonian moments
⟨φ|H^n|φ⟩, as an estimate of the overlap between a trial state |φ⟩ and energy eigenstates of the problem Hamiltonian.
Atom Computing is creating a quantum processing platform based on nuclear spin qubits. The system makes use of optical tweezers to assemble and individually manipulate neutral strontium atoms. We demonstrate the robustness of these systems by characterizing their coherence times.
Ultra-low mass WIMP's are viable dark matter candidates. However, the resulting low-energy excitations are extraordinarily difficult to detect. I will outline a new experimental platform that translates the capabilities of optomechanics to enable detection of ~1ueV excitations in superfluid helium.
Indeterministic dynamics arise in the context of interacting systems near closed timelike curves. I will discuss a relevant scenario, the "billiard-ball paradox", and will provide solutions to a quantum formulation of the problem, showing in particular how indeterminism is resolved.
Gravity is determined, within the framework of the Generation Model of particle physics, to be a universal attractive finite-ranged residual interaction of the strong nuclear force, acting between the colourless constituents of ordinary matter.
We report the development of a high sensitivity, quadrant-photodiode-based Hartmann wavefront sensor. The sensor is simple, low cost, with a bandwidth of 50kHz, and a sensitivity and dynamic range for curvature change of 10/um and 0.5/m, respectively.
Modelling and experimental results of femtosecond-laser inscribed point-by-point Bragg gratings were compared. Coupled mode theory model doesn't account for the distorted mode and fails whereas Bloch function approach consider distorted mode and provides a more accurate picture of grating dynamics.
Discussion on our recent breakthroughs in theoretical atomic structural investigations using advanced relativistic quantum mechanics.
We demonstrate the alignment of a wavelength selective switch by means of digital holography, allowing access to the spectrally-resolved full field of the output beams, a feature yielding additional insights such as crosstalk and spatial deformation of the beams.
We demonstrate the capability to address the spin sub-levels of the germanium vacancy and thus, perform all optical spin initialisation and readout. Additionally, we generate dark coherent superpositions of the germanium vacancy spin states through coherent population trapping.
Mutual strong confinement of light and sound in photonic waveguides is desirable for on-chip opto-acoustic nonlinear interactions, but very few materials are naturally guiding for both waves. Here, we present Anti-Resonant Reflecting Acoustic Waveguides (ARRAWs) as a potential solution.
We investigate how physical noise is transformed and suppressed in encoded magic state injection schemes. These circuits are key to NISQ computation and classifying their error on current devices will identify problems that larger, scaled up architectures must address.
We report on an experiment to create a big time crystal using a Bose-Einstein condensate of ultracold potassium - 39 atoms bouncing resonantly on a periodically driven atom mirror.
A continuous variable real-time quantum random number generator which extracts random numbers from the shot noise clearance of a vacuum state homodyne measurement will be built. It will include periodic real-time system health checks, tests, and alerts.
A NaI(Tl) crystal was irradiated by a strong cosmic ray-like neutron beam to characterize the cosmogenic background in NaI(Tl).This study will inform the development and analysis of NaI(Tl)-based experiments and also improve their sensitivity to probe dark matter.
We studied a direct and an inverse anisotropic structure made of Z-cut LN on the silica substrate, and evaluated the cross-polarisation conversion of linear incident polarisation and at tunable circular dichroism (CD) that can be achieved in these structures.
N.A
SuperWIMPs form a popular class of cold dark matter that naturally inherit the desired relic density from the late decays of the WIMPs. We use cosmological probes like spectral distortions, BBN and Warm Dark Matter bounds to find constraints on generic SWIMP masses and couplings.
We investigate the coupling of microwave cavity fields to an ensemble of Nitrogen-Vacancy (NV) centre spins utilising the morphological resonances in spherical/ellipsoidal dielectric resonators.
In this work we integrate a spin centre in hexagonal boron nitride with a monolithic photonic resonator in an intial step towards a scalable spin-photon interface.
Time in its current state is discussed without reference to an operator that represents the time observable, the aim of this work is to rectify this and investigate how such an observable can be represented.
In this work, we look at three different discrete-variable Wigner functions corresponding to single Weyl-Heisenberg displacements and compare them. What we find that is that these functions are equivalent up to some non-trivial phase dependent on the displacement amount.
In this paper, we demonstrate that the rate at which logical Bell states can be generated between distant fault-tolerant quantum computers is on the order of 1KHZ. This imposes a hard limit on the distributed clock speed.
We demonstrate that using the framework of finite-frame filter functions the cost required for high-quality multiqubit characterization and control is significantly lower than what is expected using the standard frequency-domain filter-function formalism.
Our work considers the problem of dual quantum state-parameter smoothing, while the probability density distribution of the unknown parameters can be either static or dynamical. Based on Bayes’ theorem, general formulas for dual quantum filtering and smoothing are given.
Can Virtual Reality make it easier to communicate Physics to young people? We evaluated Mission Gravity, an OzGrav outreach program delivered in Virtual Reality, and assessed its impact in South Australian Secondary School classrooms.
Mode-locked soliton pulses are shaped by intensity-dependent nonlinear effects. Consequently, fibre laser design provides insight into the evolution of these ultrashort pulses. We present mode-locking performance for a variety of component selections and positions in a Holmium fibre ring cavity.
Our previously implemented quantum support vector machine outperformed standard classical methods for B Meson classification (using reduced dataset). In this work we will explore the feasibility of application to particle physics showing alternative encoding methods and speedups.
This paper covers the design of achromatic phase shifters using differential waveguide dispersion. These devices are then fabrication using the femtosecond laser direct write technique.
An easily re-configurable, compact and scalable 2 µm holmium in ZBLAN laser source with multi-channel/wavelength fiber outputs of >100mW is presented and discussed.
Faced with the down-scaling of semiconductor devices and the rapid development of 2D materials-based field-effect transistors, we report on the synthesis and properties of ultrathin silver-doped indium oxide nanosheets fabricated using a simple liquid-printing process for application of semiconducting channel
Fluorescent nanodiamonds (FNDs) made from HPHT diamond have predominantly disk-like shapes. A typical FND is three times wider (eg in x-y) than it is thick (eg in z). This has important implications for the next generation of nanodiamond-based quantum sensors.
We report the formation of superconducting thin films and devices in phase-transformed Al-Si alloy and vanadium silicide (V$_3$Si) and present results of structural and electrical characterization studies and discuss the merits of these superconducting systems for novel devices in silicon.
In this paper we present a novel approach for learning relativity by combining theory (vectors, tensors) with electronic applications to the GPS system. The course is applicable as a practical introduction to the applied mathematics of relativistic theory and measurement.
A method to extract and non-perturbatively renormalise the quark and gluon momentum fractions of hadrons is demonstrated, based on the Feynman-Hellmann method applied directly to the gluonic contribution. Results from the application of this method in the presence of dynamical quarks are presented.
In this project, we are presenting our methodology for generating and detecting single heralded photons over approximately 75km of field deployed fibre which is also in use by the Griffith University IT department for classical networking purposes.
We demonstrate a device for measuring the generalized Stokes parameters of a six spatial mode beam. The device is a single-shot wavefront sensor measuring spatial complex amplitude and coherence without an external phase reference.
We present a new theory of high-order image correlation spectroscopy capable of addressing emission QY distribution of fluorescence species, a common occurrence in silicon, plasmonic or semiconductor nanoparticle-based biolabellers.
We perform a detailed study of electric dipole transitions in K, Ca$^+$, Rb, Sr$^+$, Cs, Ba$^+$, Fr, and Ra$^+$, which are of interest for studies of atomic parity violation, electric dipole moments, polarizabilities, and the development of atomic clocks.
Recently, YouTube science communicators have tried to explain lift. Unfortunately, fluids are not intuitive, and Navier-Stokes provides little qualitative insight. Saying Coanda is as incorrect as claiming equal transit, or simply saying Bernoulli. How do wings work? Navier-Stokes and viscosity!
We propose a hybrid dielectric/plasmonic approach for metasurfaces comprising colour holograms encoded into colour printed images. The metasurface employs plasmonic nanoholes in an aluminium film for colour filtering and amorphous titanium dioxide nanopillars for the phase control needed for holography.
An alternative method for calculating Hyperon transition form
factors in Lattice QCD which is based on the Feynman-Hellmann method is
formulated. Results from this method are presented for the form factors
of the Sigma to neutron transition as well as a comparison to results
from the more common three-point function method.
We present a numerical estimation of spontaneous emission factor for multiple quantum disks embedded in nanowire lasers and, investigate the impact of Purcell effect F and spontaneous emission factor β on the threshold and the L-L curves.
We reinterpret internal degrees of freedom of a Dirac fermion as a local wavefunction oriented in 4D spacetime. This is done beginning with two 2D spinors, using the quantum theory of time as well as spherical harmonics.
Optical engineering of nanoporous photonic crystals to achieve high–quality lasing
Here we model a Laser threshold magnetometer sensor with extremely high sensitivity. We predict the sensitivities of a sensor design utilising a diamond ring resonator as a function of resonator geometry and optical pump conditions.
An update on the latest developments is given on the toroidal analyser for angle-resolved photoelectron spectroscopy at the Soft X-ray Spectroscopy beamline, Australian Synchrotron.
LEMAQUME is an EU-QuantERA project and aims to build a proof-of-principle prototype of a ferromagnet gyroscope. The precession of a magnet levitating in low magnetic fields allows for tests for exotic bosons, and, in the future, to the gyrogravitational ratio.
In this work we will present results of a LBIC and EBIC study of n-on-p planar structures created by RIE induced type conversion in MCT, as well as cross-sectional EBIC imaging undertaken at cryogenic temperatures.
We report on the detection of seismic signals using Distributed Acoustic Sensor (DAS) over the dark fibers in the campus telecommunication network. The system implementation, data analysis and signal post-processing methods optimized in this study will be presented.
An integrated lithium niobate on insulator ring resonator photonic device with efficient high-speed modulators hosts a synthetic frequency dimension lattice, revealed by characterizing its steady-state performance and real-time acquisition of its tight-binding model band structures.
A transparent smart wound dressing has been developed using Nitrogen Vacancy Centre Microdiamonds within a silk film for temperature detection, enabling early intervention of surface infections for acute wounds.
A microneedle is a biomedical device that could be used for painless administration and extraction of fluids into an individual.
This study details the process of creating a patch of diamond microneedle and optimising its properties.
Theoretical investigation of excitons in semiconductor quantum-well designed not to have Coulomb bound excitions, but shows excitons bound by photons when placed in optical microcavity. The spectrum is calculated from theory and compares well with recent Nature Physics experiment spectrum.
Chirality is a fundamental property in many physical systems ranging from particle physics, topological and quantum systems, complex molecules and chiroptical phenomena. Many of these phenomena occuras surface states, at high energy and frequency, due to complex meta structures or plasmonic systems,which inevitably add loss. In this work we realise a new class of resonator, the Anyon cavity...
An example of student misconception of a physical concept in first year physics - energy quantisation - is described. This went undetected using standard assessment and was uncovered by descriptive writing assessment.
Nano/Microstructure for spectra modulation by laser fabrication
Engineering of the structure of nanoporous anodic alumina for iontronic sensing
Tricouplers can be utilised for nulling interferometry. We present laboratory characterisation of 3D tricouplers fabricated by ultrafast laser inscription as well as numerical solutions to coupled mode equations providing a parameter scan to optimise fabrication.
We describe our efforts to realise on-demand PCV creation in quasi-2D 87Rb spinor BEC with uniform density, created in an optical trap enabled by digital-micromirror devices (DMDs).
In this contribution, we report on the progress of integrating high-speed detectors on PIC for achieving single-chip microwave photonic filters.
Using a sample-on-SSPD approach, we demonstrate optically accessible Er sites in Si with emission at telecom wavelengths. These sites contain electron spins with a coherence time of 0.5 ms and Rabi frequencies of over 1 MHz.
Using resonant photoluminescence spectroscopy, we show a 350 kHz upper bound on homogeneous broadening, less than 400 MHz inhomogeneous linewidth and long spin lifetimes of Er in Si. These parameters are promising for future quantum information and communication applications.
We propose a planar device featuring vanadium dioxide (a phase change material) for optical limiting purposes. We first characterize the static and dynamic response with numerical simulations and finally we verify the performances with experiments.
Methods for Optical remote sensing of subsurface water properties such as temperature and salinity will be described, along with the transition of successful lab studies to the field. Challenges and achievements will be presented.
CCD array based detection of optical scatter has allowed tomographic reconstruction of objects immersed within scattering media. Encouraging results using the inverse Radon transform provide a basis for further investigation and improvement in detection of objects within diffuse media.
Here the thermal properties (thermal conductivity and heat capacity) of porous silicon thin films were experimentally investigated as a new material platform, for the realization of high speed and high sensitive thermal sensors.
Overlap removal is an integral step in all ATLAS analyses wherein ambiguities in object reconstruction are resolved. Established methods compare the geometric distance between reconstructed objects. These will be compared to new approaches based on Global Particle Flow.
The recent Scientific highlights from the Pelican - time of flight cold neutron spectrometer will be presented.
We derive a new stochastic hydrodynamic approach for the description of interacting Bose gases that is capable of computing non-equilibrium quantum correlations, even for short-wavelength phenomena. We perform such calculations in quantum shock wave scenarios.
we demonstrate the electro optic comb from the recirculating modulator can be used for high performance lowpass filter without reshaping the comb, which provide the potential integration of the on-chip signal processor. We also demonstrate high-speed image and video processing.
SDR is an exciting pathway toward spintronic devices. This work presents the first measurements of the thermal activation energy and carrier capture cross-sections of the SDR-active Ga2+ interstitial defect using a new experimental technique: polarized photo-induced current transient spectroscopy (pol-PICTS).
Neutron scattering is a powerful tool for investigating a variety of condensed-matter systems, and using spin-polarised neutrons reveals further unique information. The possibilities for performing scattering experiments with polarised neutrons at the Australian Centre for Neutron Scattering will be outlined.
We will discuss our investigation into the inclusion of the positronium formation cross section, both empirically and theoretically determined, in the calculation of transport properties in the noble gases.
To ensure each detector module comprising the upgraded ATLAS ITK detector is produced at a high standard, detector modules undergo rigorous Quality Control and Quality Assurance. This work presents the optical metrology surveys and results.
In this abstract we detail a method of printing and testing a trichromatic organic photocapacitor for stimulating neurons via capacitive coupling. This work involves using a Sonoplot Microplotter II in conjuction with organic polymers dissolved in non-toxic solvents.
Atomically thin antimony doped indium oxide nanosheets have been synthesized utilizing a scalable liquid metal-based printing technique. The work proposes a viable pathway for realizing ultra-thin transparent semiconducting oxides with enhanced electronic and optical properties for next-generation optoelectronics.
This presentation provides recent progress on fast photoionisation detection of a single Er3+ ion using radio-frequency reflectometry and spectral broadening of single ions with the aim of developing efficient deterministic readout of single optical centres.
A design study is ongoing for a fixed field beamline to transport proton beams from 0.5-3.5MeV. Magnet prototyping and particle simulations are underway to demonstrate technologies enabling rapid depth scanning for hadron therapy.
Weights in the convolutional neural network are stored as memory in optoelectronic devices. The performance of the neural network drops in a few milliseconds. We use a model to prolong the memory to several minutes.
We use the radiative potential method to report on the first detailed study of the interplay between QED and many-body effects in heavy atoms for E1 transition amplitudes.
In this talk, we introduce a new Python library, named QuanGuru, that implements powerful abstractions providing a broad range of useful and highly versatile functionalities, and show QuanGuru examples.
We introduce states that are the asymptotic eigenstates of the SU(2) lowering operator and are naturally produced in steady-state Dicke superradiance. A spin emitter in these states radiates classical-like coherent light, although these states are quantum entangled.
Construct the $\mathcal{PT}$-symmetric QRM, derive the spectrum and investigate the $\mathcal{PT}$-phase boundaries (as exceptional surfaces) at different parameter regimes.
Both the Jaynes-Cummings-Hubbard and Dicke models can be thought of as idealised models of a quantum battery. In this work we examine the "charging" properties of such systems and find that there is no quantum advantage scaling with system size.
Radiotherapy treatment in Low- and Middle-Income Countries is under significant strain due to environmental, socio-economic and geographic factors which cause Linear Accelerators used in treatment to breakdown. This study aims to quantify the problem and provide robust alternatives.
The Belle II Experiment is a high-energy collision experiment located in Japan, aiming to record the largest dataset of B-mesons ever produced.
B-mesons provide an unique laboratory to explore phenomena both within and beyond the Standard Model, such as quark-mixing, flavour oscillation and charge-parity violation.
Searches for leptonically decaying B mesons can provide a method of...
We have developed software and present significant evidence for how virtual reality can be used to correct common misconceptions of introductory physics students when learning Newtonian mechanics. Compared with standard instruction, students using VR improve their FCI scores by 13%.
Nanomechanical computers promise radiation robust, low energy information processing, however no scalable approach has so far been devised. Here we experimentally demonstrate a scalable, CMOS-compatible nanomechanical logic gate that could realistically scale to an energy cost close to Laundauer's bound.
A presentation of the conceptual design and simulation of a compact beamline using high gradient X-band accelerating structures at the University of Melbourne X-lab which can be used as input for an Inverse Compton Scattering X-ray light source.
The choice of metal contacts on the surface of porous silicon films for fabricating opto-electronic devices is affected by post-metal deposition processing steps. In the present work, Al, Cr/Au, Ti, and Ti/Pt/Au metallisation schemes were investigated for fabricating such devices.
Highly local thermal effects which occur during a nanosecond laser pulse cause a significant change in the size distribution of metallic nanoparticles during a z-scan which can affect the z-scan results.
we integrate solid immersion micro-lenses into a fibre-based microcavity-polaritons system to increase photonic confinement and achieving stronger optical nonlinearities.
We probe the distributions of spin properties responsible for reverse intersystem crossing in exciplex-based TADF OLEDs through spectrally resolved magneto-luminescence.
We study electron capture and ionisation in fully-stripped neon ion collisions with ground-state atomic hydrogen using the two-centre wave-packet convergent close-coupling (WP-CCC) method over the energy range from 1 keV/u to 2 MeV/u.
Plasma-driven epitaxy on nitrogen-terminated diamond can create very thin nitrogen-vacancy center layers, useful for quantum sensing. To reduce nitrogen loss during epitaxy, we study the stability of the nitrogen termination in these growth plasmas.
We investigate methods and applications of in-situ aberration correction, utilising a modified holographic optical trapping setup, to rapidly fabricate high-resolution 3D microstructures for studying biological systems
Ga-hyperdoped germanium fabricated from ion implantation and flash lamp annealing has been shown to be superconducting at low temperatures of ~0.5 K. Here, we fabricate Ga-hyperdoped germanium from GeGa deposition and pulsed-laser melting and obtain a Tc of ~0.86 K.
In this talk, I demonstrate how mode-selective interactions, ubiquitous in quantum optics and field theory, lead to causality violations. I resolve this problem by showing that such interactions necessarily induce a fundamental time-delay in the propagation of input modes.
An overview of the ATLAS strip tracker upgrade programme, with a focus on the testing and optimisation of assembly procedures in the lead up to end-cap module construction at the University of Melbourne.
We explore the creation and characterization of exfoliated zirconium telluride nanostructures in order to investigate their electronic properties through a combination of photoemission electron microscopy and microARPES.
The first Southern Hemisphere X-band Laboratory for Accelerators and Beams (X-LAB) is under construction at the University of Melbourne, it will form the basis for developing a compact accelerator for medical applications, such as radiotherapy and compact light sources.
This work shows the relative success of using relativistic Hartree-Fock methods to theoretically predict characteristic x-ray spectra of zinc. We compare our results to experimental data, yielding promising fits.
Small arrays of Imaging Air Cherenkov Telescopes were simulated to study the potential performance of an Australia-sited array, which would contribute to achieving 24-hour all-sky coverage at GeV and TeV energies.
We report progress towards trace detection of the noble gas isotope $^{39}$Ar at the Australian Atom Trap Trace Analysis facility. Argon-39 has a natural abundance $^{39}$Ar/Ar$=8×10^{−16}$ and half-life of 269yrs making it useful for radiometric dating on an anthropogenic timescale.
Triplet-triplet annihilation is a spin-selective process which exhibits a magnetic field response. Here we revisit the fundamental theory used to model this field response, explaining the origins of key equations and the assumptions behind them.
Multiplexing detection of nucleic acids has been developed using the temporal dimension of luminescence lifetimes, which are tuned by Luminescence Resonance Energy Transfer between a donor europium complex and an acceptor dye tagged onto oligonucleotides, decoded by time-resolved image cytometry.
Two-dimensional semiconducting oxide was synthesised via the developed liquid metal-based synthesis technique. The material has wide bandgap and exhibits p-type behaviours. The fabricated field-effect transistors showed impressive performances which render this material promising for electronics applications.
We use a lithium niobate whispering gallery mode resonator embedded in a microwave cavity to efficiently generate a dual frequency comb. Judicious use of crystal symmetries leads to our two combs being orthogonally polarized, and they are ultrastable in frequency.
Plasma Physics has made surprising separate contributions to Welding, Lightning and Circuit interruption.
Quantum theory applied to gravitational potentials, in conjunction with a galaxy’s halo temperature, can be used to understand why some galaxies are dark matter dominated while others are observed to have almost no dark matter.
“The upconversion nanoparticles (UCNPs) have recently attracted great attention as a fluorescence probe for use in super-resolution microscopy (SRM). This is due to the advantages of UCNPs over other fluorescence probes such as fluorescent proteins owing to their unique optical properties, lack of photobleaching and sharp emission peaks. However, the ultraviolet (UV) light that can be emitted...
We perform coordinate transformations on the Vaidya metric in advanced coordinate to reduce it into the Rindler metric near the horizon. We then apply the periodicity time trick to extract Hawking temperature.
