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Chiara Decaroli (Institute of Quantum Electronics, ETH)Poster Session 1
INTRODUCTION
Ion traps are a robust and promising platform for quantum information processing and for the implementation of a quantum computer. However, major challenges exist in scaling these systems to the level required for full-scale quantum computing. I will describe work concerned with addressing two of these challenges; namely connecting multiple trap zones in more than one dimension,...
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Dr Soumen Ghosh (Department of Physics, University of California-San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0319, USA)Poster Session 1
Low energy positron beams are used in a variety of applications, including studies of atomic and condensed matter systems.[1] We study here the properties of a magnetically guided cold positron beam (generated in the conventional manner from a 22Na radioisotope source and solid neon moderator [2]) and their relationship to the different magnetic fields along the axis of a 7 m long scattering...
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Mr Johannes Thielking (Physikalisch-Technische Bundesanstalt)Poster Session 2
The thorium-229 nucleus possesses a unique first excited state at an energy of only about 7.8 eV, coupled to the ground state by a transition with a natural linewidth in the mHz range. This transition can be used as a reference for an optical clock that is highly immune to field-induced frequency shifts and as a sensitive probe of temporal variations of fundamental constants [1]. Despite many...
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Markus Wiesinger (Max-Planck-Institut für Kernphysik, Heidelberg, Germany and RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama, Japan)Poster Session 2
Precise measurements of the fundamental properties of the proton such as its mass, lifetime, charge radius, and magnetic moment are important for our understanding of the physics of atomic and nuclear structure as well as for tests of fundamental symmetries. As one of very few particle-antiparticle pairs which are directly comparable, the proton and antiproton serve as an important laboratory...
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Dr Jesus J. del Pozo (University of Granada)Poster Session 1
The coupling of ions stored in different traps through the charges they induce in a common electrode was proposed in Ref. [1], but it has not been
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accomplished yet. The completion of such a system would be an outstanding technological breakthrough in quantum electronics and would pave the
way for the implementation of hybrids systems for quantum information [2]. A pioneer work using... -
J. Horn-Stanja (Max-Planck Institute for Plasma Physics, Garching and Greifswald, Germany)Poster Session 2
In contrast to a conventional electron-ion plasma, the electron-positron pair plasma is characterized by the mass balance of the two components. Theoretical studies thus predicted long time ago a fundamentally new insight into plasma physics by studying these plasmas. Only recently experimental activities have become more precise e.g. by the APEX project which aims for the creation of a...
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Dr Kangda Wu (University of Science and Technology of China)Poster Session 2
Quantum resource theories seek to quantify sources of non-classicality that bestow quantum technologies their operational advantage. Chief among these are studies of quantum correlations and quantum coherence. The former to isolate non-classicality in the correlations between systems, the latter to capture non-classicality of quantum superpositions within a single physical system. Here we...
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Oliver Corfield (Imperial College London)Poster Session 1
Following results of laser cooling a single ion of $^{40}$Ca$^+$ to its motional ground state ($\bar{n}_z=0.02(1)$) in the axial domain of a Penning trap [1], we report simultaneous sideband cooling of both radial modes to near their ground state in the same apparatus. Sideband cooling is performed on the $S_{1/2} \leftrightarrow D_{5/2}$ electric quadrupole transition at 729 nm, and average...
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Sascha Rau (Max-Planck-Institut für Kernphysik)Poster Session 2
The former $g$-factor experiment located in Mainz performed various $g$-factor measurements on highly charged ions, resulting in tests of bound state QED [1] and the most precise value for the atomic mass of the electron [2]. These measurements will be continued within a new experiment at the MPIK with access to heavier highly charged ions. Meanwhile the follow-up experiment in Mainz, which is...
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Christoph Schweiger (Max-Planck-Institut für Kernphysik, Heidelberg)Poster Session 2
The high-precision Penning-trap mass spectrometer PENTATRAP (1) is currently being commissioned at the Max-Planck-Institut für Kernphysik in Heidelberg. It aims at mass-ratio measurements of stable and long-lived highly-charged ions with a relative uncertainty of below $10^{-11}$, a precision so far only achieved for a few relatively light elements (2).
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The mass-ratio measurement is carried... -
Mr Nishant Joshi (Raman Research Institute, C. V. Raman Avenue, Sadashivanagar, Bangalore 560080, India )Poster Session 1
Abstract: Low temperature ion-atom interactions have been the object of growing interest over the past decade. Due to the availability of laser cooling for many atoms (Li, Na, K, Rb, Cs, Ca, Sr, Ba, Yb, etc.)[1,2,3] and ions (Ca+, Sr+, Ba+, Yb+ , etc)[4,6,7], the interactions between such ions and atoms have been explored experimentally at mK temperatures[5,7,8]. In the case of optically...
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James Harrington (Max-Planck-Institut für Kernphysik, Ulmer Fundamental Symmetries Laboratory RIKEN)Poster Session 2
A number of upgrades and stabilisation techniques to the BASE apparatus [1], motivated by improving upon the recent 1.5 ppb measurement of the antiproton $g$-factor [2] and other fundamental properties of the antiproton, are presented.
A new modified-cyclotron mode detection system has been commissioned and installed into the BASE apparatus. The primary function of this instrument is to...
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Jack Mccauley Jones (Swansea University (GB)), Peter Knapp (Swansea University (GB))Poster Session 1
Antihydrogen, the bound state of a positron and an antiproton, is being studied by the ALPHA collaboration at CERN so that it can be compared to its matter counterpart, hydrogen. Antihydrogen is synthesised by merging plasmas of antiprotons and positrons in a magnetic trap, allowing a small fraction of the antihydrogen atoms created, the coldest, to remain trapped.
Decreasing the temperature...
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Mr Kai Krimmel (Helmholtz-Institut Mainz; QUANTUM, Institut für Physik, JGU Mainz)Poster Session 2
Radio-frequency (rf) Paul traps operated with multifrequency rf trapping potentials provide the ability to independently confine charged particle species with widely different charge-to-mass ratios. In particular, these traps may find use in the field of antihydrogen recombination, allowing antiproton and positron clouds to be trapped and confined in the same volume without the use of large...
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Christian Zimmer (Ruprecht Karls Universitaet Heidelberg (DE))Poster Session 1
Several experiments at CERN aim at testing the CPT-theorem and weak equivalence principle using antimatter, among them the AEgIS experiment. Here, antihydrogen - produced via resonant charge exchange - will be used for precision measurements where the achievable sensitivity is determined by the temperature of the
antiprotons.We are investigating laser-cooling of anionic molecules to...
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Simon Lechner (University of Vienna (AT))Poster Session 1
Collinear laser spectroscopy (CLS) is a powerful tool, with a long and successful history at COLLAPS/ISOLDE, to access nuclear ground state properties such as spin, charge radius, and electromagnetic moments with high precision and accuracy [1]. Conventional CLS is based on the optical detection of fluorescence photons from laser-excited ions or atoms. It is limited to radioactive ion beams...
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Mr Elmer Gründeman (LaserLaB, Vrije Universiteit Amsterdam)Poster Session 1
Bound state quantum electrodynamics is one of the most thoroughly tested theories in physics, but was recently challenged by measurements done on muonic atoms, where a discrepancy of >5$\sigma$ was reported between the nuclear charge radii extracted from spectroscopic measurements on muonic hydrogen and electronic hydrogen [1-4]. To gain new insights into the “proton radius puzzle” we aim to...
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Mr Richard Lange (Physikalisch-Technische Bundesanstalt)Poster Session 1
The ${}^{171}$Yb${}^+$ ion employed in our single-ion optical clocks features two transitions used for the realization of frequency standards, the ${}^2$S${}_{1/2}$ to ${}^2$D${}_{3/2}$ electric quadrupole (E2) $[1]$ and the ${}^2$S${}_{1/2}$ to ${}^2$F${}_{7/2}$ electric octupole (E3) $[2]$ transition. The E2 transition frequency shows a significantly higher sensitivity to frequency shifts...
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Steven Armstrong Jones (Aarhus University (DK))Poster Session 1
Steven A. Jones (1) from the ALPHA collaboration (2)
1) Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
steven.armstrong.jones@cern.ch
2) CERN, CH-1211 Geneve 23, SwitzerlandAntihydrogen offers a unique way to test matter/antimatter symmetry. Antihydrogen can reproducibly be synthesised and trapped in the laboratory for extended periods of time [1][2],...
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Mr Johannes Mielke (Institut für Quantenoptik, Leibniz Universität Hannover)Poster Session 2
We present techniques tailored for sympathetic cooling and manipulation of a single (anti-)proton in a Penning trap system. Inside our trap a double-well potential is engineered for co-trapping an atomic ion, which enables for the use of quantum logic spectroscopy inspired cooling and readout schemes [1, 2]. These should allow for preparation at sub-Doppler temperatures and a readout of the...
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Maxime Mougeot (Université Paris-Saclay (FR))Poster Session 2
The trends of nuclear binding-energies, obtained from high-precision atomic mass values, are sensitive to a wide range of nuclear structure phenomenon such as shell effects or onsets of collectivity. Hence, binding energies enable to track down the evolution of nuclear structure in yet unexplored region of the nuclear chart, also providing essential inputs to many nuclear models.
Three...
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Barbara Maria Latacz (CEA, Université Paris-Sud (FR))Poster Session 2
The main goal of the GBAR (Gravitational Behaviour of Anihydrogen at Rest) experiment is to test the week equivalence principle for $\bar{H}$, which has never been measured directly. In order to perform that very complex experiment, ultracold antihydrogen atoms ($\approx 10 \mu K$) are needed. As it is impossible to cool down neutrals to required temperature, GBAR is going to produce the...
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Matthew Anders Bohman (Max-Planck-Gesellschaft (DE))Poster Session 1
Nearly complete quantum control of individual trapped ions has become commonplace in many precision spectroscopy, metrology, and quantum information experiments. However, while measurements of the properties of fundamental particles for CPT tests have had remarkable recent successes [1, 2, 3], they have been limited to 0.3 ppb precision by long measurement times and particle temperatures on...
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Janine Nicodemus (Institut für Physik, Universität Mainz - Germany), Daniel Pijn (Institut für Physik, Universität Mainz - Germany)Poster Session 2
Recent advances in trapped ion quantum technology have led to impressive results including the demonstration of four qubit GHZ states using subsequent entanglement gates [1] and a dc magnetometer with quantum enhanced sensitivity [2]. We will present the underlying technological advancements, starting with a high-speed multi-channel waveform generator developed in Mainz. The system delivers...
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Ms Charlaine Roth (LaserLaB, Vrije Universiteit Amsterdam)Poster Session 1
Quantum electrodynamics (QED) is one of the best tested theories in physics [1]. However, energy levels in atomic hydrogen have been determined with much higher accuracy than what QED theory can provide, because it is hampered by the uncertainty in the experimentally determined proton charge radius. Therefore, spectroscopic measurements on muonic hydrogen ($\mu$H) were performed which improved...
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Mr Alexander Egl (Max-Planck-Institut für Kernphysik)Poster Session 1
The ALPHATRAP experiment is a Penning-trap setup dedicated to test bound-state quantum electrodynamics by determining the g-factor of the bound electron in the electric field of highly charged ions (HCI) with ultra-high precision.
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The ALPHATRAP experiment is currently in the final stage of commissioning.
The setup exists of a cryogenic double Penning-trap tower in which the HCI can be stored... -
Mr Jonas Karthein (Ruprecht Karls Universitaet Heidelberg (DE))Poster Session 1
The Penning-trap mass spectrometer ISOLTRAP located at the radioactive ion beam facility ISOLDE at CERN performs high-precision mass measurements of short-lived nuclides. This gives access to the study of nuclear structure effects like the location of shell and subshell closures and provides precision $\beta$-decay $Q$-values to test nuclear models and fundamental interactions. For three...
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Mr Cyril Chatou (Aix Marseille Université / CNRS), Ms Marylise Marchenay (Aix-Marseille Université / CNRS)Poster Session 2
A cloud of trapped ions, represented here by a four level atomic system $\mid S_{1/2}>,\mid P_{1/2}>,\mid D_{3/2}>$ and $\mid D_{5/2}>$, is probed by the collection of photons from the transition $\mid P_{1/2}>$ to $\mid S_{1/2}>$.
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Figure : Four level atomic system of Ca+ ionsThe lambda configuration with lasers at 866nm and 397nm allows for a two-photon dark state to take...
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Alice Schmidt-MayPoster Session 2
Cooling internal degrees of freedom by inelastic collisions is a widely applied method in cold molecule physics, especially for species that lack the possibility of laser cooling. [1] Despite this, the state specific rate coefficients are commonly unknown. Experimental data for ions at low temperatures, of the order of a few Kelvin, is particularly sparse. Our group has previously reported...
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Norman V. Ewald (Van der Waals-Zeeman Instituut, Institute of Physics, Universiteit van Amsterdam, Netherlands)Poster Session 1
We report on our hybrid experiment which aims at studying trapped ions interacting with ultracold atoms that are off-resonantly coupled to Rydberg states. Since the polarisability of the Rydberg-dressed atoms can be extremely large, the interaction strength between ions and atoms increases tremendously as compared to the ground state case. Such interactions may be mediated over micrometers and...
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