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02/07/2023, 19:00
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Paolo Crivelli (ETH Zurich (CH))03/07/2023, 08:30
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Prof. Thomas Udem03/07/2023, 08:35
Precise determination of transition frequencies of simple atomic systems are required for a number of fundamental applications such as tests of quantum electrodynamics (QED), the determination of fundamental constants and nuclear charge radii. The sharpest transition in atomic hydrogen occurs between the metastable 2S state and the 1S ground state with a natural line width of only 1.3 Hz. Its...
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Aldo Antognini (Paul Scherrer Institute)03/07/2023, 09:10
Laser spectroscopy of muonic atoms, hydrogen-like atoms formed by a negative muon and a nucleus, has recently provided the charge radii of the lightest nuclei (proton, deuteron, 3He and 4He) with unprecedented accuracy. In this talk we present laser spectroscopy of these exotic atoms and their contribution to nuclear physics. Emphasis will be given to the new results in 3He.
Moreover we...
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Simon Scheidegger03/07/2023, 09:45
Precision spectroscopic measurements in the hydrogen atom have a long tradition and extensive studies of transitions between states with principal quantum number $n\leq12$ have been carried out [1-6]. These measurements can be used to determine values of the Rydberg constant and the proton charge radius [7]. We present a new experimental approach to perform measurements of transition...
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Clara Peset (Madrid University)03/07/2023, 10:40
Precision atomic spectroscopy provides a solid model independent bound on
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the existence of new dark forces among the atomic constituents. We focus on the keV-GeV region investigating the sensitivity to such dark sectors of the recent measurements on muonic atoms at PSI, muonium and positronium. To this end we develop for the first time, the effective field theory that describes the leading... -
Gianluca Janka (PSI & ETH Zurich (CH))03/07/2023, 11:05
Due to its lack of internal structure, Muonium is an excellent candidate to provide stringent tests for bound state QED. Furthermore, Muonium is a sensitive probe for the existence of exotic dark-sector particles, new muonic forces, and hidden dimensions. During the Mu-MASS [1] beamtime in December 2019 at the LEM beamline at PSI, we demonstrated the creation of an intense directed beam of...
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Prof. Krzysztof Pachucki03/07/2023, 11:30
While electrons are point-like particles, atomic nuclei have an intricate internal structure. Modern atomic and molecular calculations typically neglect this nuclear structure and represent the nuclei through the static charge and magnetic-moment distributions. There are, however, a number of important fundamental questions for which we do not have fully satisfactory answers yet: Is the...
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Aldo Antognini (Paul Scherrer Institute)03/07/2023, 16:00
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Peter Stoffer03/07/2023, 16:05
The baryon asymmetry of the universe points towards CP-violating sources beyond the Standard Model. If these consist of heavy new particles, their indirect low-energy effects can be described by effective field theories. I will describe theoretical challenges and recent progress within this framework for the extraction of bounds on CP violation, focusing on hadronic EDMs. In particular, I will...
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Eric Hessels03/07/2023, 16:40
The EDM$^3$ collaboration is pursuing a measurement of the electric dipole moment of the electron using barium monofluoride molecules embedded in a cryogenic argon solid. The method allows for very large samples of molecules to be used and therefore very good statistical uncertainties can be expected. The scheme also shows promise for control of systematic uncertainties. An update on our...
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Lorenz Willmann03/07/2023, 17:45
Experimental searches for permanent electric dipole moments (EDM) on a fundamental particle are predominantly executed in composed systems, such as neutrons, atoms or molecules. The experiments have reached a sensitivity which narrows the gap to the Standard Model predictions significantly which requires an improved understanding of the properties of composed systems in a particular...
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Dr Efrain Patrick Segarra03/07/2023, 18:20
The next-generation neutron electron dipole moment (EDM) measurement is currently under construction at the Paul Scherrer Institute (PSI), the n2EDM experiment. n2EDM will deliver, at minimum, an order of magnitude better sensitivity as compared to current limits on the neutron EDM. This increased sensitivity on the neutron EDM will provide stringent constraints on time-reversal violating...
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Chavdar Dutsov (Paul Scherrer Institute (CH))03/07/2023, 18:45
At the Paul Scherrer Institute we are developing a high precision instrument to measure the electric dipole moment (EDM) of the muon. The presence of a permanent EDM in an elementary particle would imply a violation of time invariance and the combined symmetry of Charge-Parity (CP). While the Standard Model of particle physics allows for a large CP-violating phase, it also predicts EDMs that...
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Paul Wegmann (ETH Zurich)03/07/2023, 21:00Poster
The LEMING (LEptons in Muonium INteracting with Gravity) experiment aims to measure the gravitational acceleration of Muonium (M = e$^−$ + μ$^+$ ) in the gravitational field of the earth. An essential part of this experiment is the reliable detection of M’s decay products, i.e. e$^+$ and e$^−$, at temperatures below 1$\,$K. The electron, referred to as atomic electron, can be accelerated to...
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Sergey Vasiliev (University of Turku (FI))03/07/2023, 21:00Poster
We present a recent progress towards experiments with hydrogen atoms at ultra-low temperatures, probing the ultra-low energy domain with the lightest and simplest of neutral atoms, which has served as a test probe of the fundamentals of physics throughout the era of modern physics. This work is a part of an international collaboration GRASIAN (Gravity, Spectroscopy and Interferometry with...
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Philipp Peter Blumer (ETH Zurich (CH))03/07/2023, 21:00Poster
The upgrade of the antiproton decelerator, the Extra Low ENergy Antiproton (ELENA) ring started its operation at CERN in the Fall of 2021 and opened a new era for antihydrogen research. The Gravitational Behaviour of Antihydrogen at Rest (GBAR) collaboration has since started taking data and aims to directly test the Weak Equivalence Principle with a free fall of ultracold antihydrogen...
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Dr Oguzhan Kara (Paul Scherrer Institut (PSI))03/07/2023, 21:00Poster
Low-energy properties of the nuclei can be precisely examined via highly accurate measurements of atomic transitions. As the Bohr radius of hydrogen-like atoms decreases with increasing orbiting particle mass, the muonic atoms (hydrogen-like atoms formed by a negative muon and a nucleus) have enhanced sensitivity to nuclear structure effects. The HyperMu experiment is motivated to measure this...
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Joanna Peszka (ETH Zurich)03/07/2023, 21:00Poster
The muCool project aims to develop an innovative device for generating low-energy, high-intensity, and high-quality muon beams for future high-precision experiments such as muon g-2 measurements, muonium spectroscopy, and muonium gravity studies. These experiments, involving muons and muonium atoms, hold significant potential for testing theoretical predictions of the Standard Model within a...
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Irene Cortinovis (ETH Zurich (CH))03/07/2023, 21:00Poster
Muonium, the purely leptonic bound state of an anti-muon and an electron, is an excellent candidate to probe bound state QED and search for new physics beyond the Standard Model.
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I will introduce Mu-MASS, aiming to improve the Muonium 1S-2S transition and Lamb Shift by orders of magnitude. I will present our latest experimental progress and results, with a special focus on the New Physics... -
Elise Wursten (RIKEN)03/07/2023, 21:00Poster
The Baryon Antibaryon Symmetry Experiment (BASE) at the antiproton decelerator of CERN is dedicated to high-precision measurements of the fundamental properties of the proton and the antiproton. Using single-particle multi-Penning-trap techniques, we compare the proton/antiproton charge-to-mass ratios [1] and magnetic moments [2,3] at a relative uncertainty at the 10-parts-per-trillion and...
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Hüseyin Yildiz03/07/2023, 21:00Poster
The observed matter-antimatter asymmetry in the universe has yet to be understood. The experiments of the BASE Collaboration are dedicated to rigorous tests of the fundamental CPT symmetry in order to tackle this mystery. For this purpose, BASE compares the properties of the proton and the antiproton with highest accuracy, specifically the magnetic moments/g-factors [1,2] and the...
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Ivo Schulthess (University of Bern)03/07/2023, 21:00Poster
The LUXE experiment at the DESY in Hamburg (DE) will study strong-field quantum electrodynamics in the interactions of a beam of electrons or photons with a high-intensity laser. New electrons, positrons, and photons can be created in Compton and Breit-Wheeler processes. The main objective of LUXE is to measure the laser intensity dependence of the matter-antimatter pair production rate....
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Derya Taray (Max-Planck Institute of Quantum Optics)03/07/2023, 21:00Poster
The energy levels of hydrogen-like systems can be both calculated and measured very precisely. Precision spectroscopy of two transitions at the current level of accuracy allows the determination of the Rydberg constant and the proton charge radius. Comparison with an additional transitions can serve as a consistency check for the theory of quantum electrodynamics. The recent discrepancy in...
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Anna Soter (ETH Zürich)04/07/2023, 08:20
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Pierre Cladé (Laboratoire Kastler Brossel (FR))04/07/2023, 08:25Talk
Using an atom interferometer, it is possible to precisely measure the ratio between the Planck constant and the mass of an atom. This measurement allows improving the determination of the fine structure constant α. By using this value in the QED prediction of the magnetic moment of the electron, it is possible to precisely test the Standard Model. This test is particularly relevant as it is...
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Prof. Valery Nesvizhevsky (Institut Max von Laue - Paul Langevin)04/07/2023, 09:00Talk
The Standard Model of particle physics perfectly describes most of the observed phenomena, but leaves a number of problems unresolved, including the origin of the matter-antimatter asymmetry, the nature of dark matter, the absence of observed CP violation in the strong sector, the fine tuning needed for light Higgs. Most extensions of the Standard Model involve the introduction of new...
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89. Exploring dark matter and quantum space-time fluctuations through precision laser interferometryAldo Ejlli (Cardiff University)04/07/2023, 09:35Talk
In this talk, I present a novel approach based on precision laser interferometry that combines the search for axion-like particles and low-mass scalar-field dark matter with the investigation of quantum space-time fluctuations. For the dark matter search, our method employs polarimetry with a Fabry-Perot cavity in combination with high birefringence crystals to achieve unprecedented...
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Stephen Hogan04/07/2023, 10:40Talk
The most precise measurements of the acceleration due to gravity, g, of atoms are performed using the techniques of atom interferometry [1]. In general these approaches rely on the preparation of translationally cold samples of ground-state atoms and are therefore at present challenging to implement for tests of the Weak Equivalence Principle (WEP) with neutral antimatter - in particular...
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Dr Christopher McCabe (King's College London)04/07/2023, 11:15Talk
In this talk, I will introduce AION, a multi-stage atom interferometer project that aims to detect ultra-light dark matter candidates. The first stage, AION-10, will stand 10m tall in a stairwell in the Physics Department in the University of Oxford. AION-10 will operate in a gradiometer configuration, which means that two identical atom interferometers are run simultaneously, launching from...
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Philipp Heil04/07/2023, 11:50Talk
The present best direct limit on the neutron electric charge is $(-0.4+-1.1)10^-21$ e and was measured in a precision experiment by Baumann and colleagues in the 1980’s [1]. In Bern we are pursuing the QNeutron project which investigates an innovative technique to measure ultra-small angle neutron beam deflections. The experimental apparatus consists of a symmetric Talbot-Lau type neutron...
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Daniel Kienzler04/07/2023, 16:35
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Jean-Philippe Karr (Laboratoire Kastler Brossel (FR))04/07/2023, 16:40Talk
Spectroscopy of the HD$^+$ molecular ion has made a ''quantum'' leap in recent years, reaching part-per-trillion precision by use of techniques for Doppler-free excitation. The theoretical precision has also been improved, both in the spin-averaged transition frequencies and in hyperfine structure.
Under the assumption that the Standard Model correctly describes the physics of HD$^+$,...
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Ronald Fernando Garcia Ruiz04/07/2023, 17:45Talk
Recent advances in precise control and study of molecules have opened up new opportunities for fundamental physics research. Radioactive molecules, in particular, can be artificially created to contain nuclei with extreme proton-to-neutron ratios, providing an extreme sensitivity to symmetry-violating nuclear properties. Precision measurements of these systems can offer unique and...
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Nick Schwegler (ETH Zurich), Mr Fabian Schmid (ETH Zurich)04/07/2023, 18:20Talk
The complexity and variety of molecules offer promising applications in metrology and quantum information that go beyond what is possible with atomic systems. We aim to study light molecular ions that are amongst the most fundamental and simplest molecules. Their internal structure can be calculated, making them prime candidates for the determination of fundamental constants as well as for...
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Aleksandr Shlykov04/07/2023, 18:45Talk
Precision spectroscopy of dipole-forbidden rovibrational infrared transitions in molecular ions could serve as a probe for detecting possible temporal variation of fundamental constants and testing fundamental theories [1]. However, until recently, it was impossible to achieve the required precision due to the lack of control over the molecular ions on a single quantum level. We developed new...
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Ivo Schulthess (DESY)04/07/2023, 21:00Poster
The Jaynes-Cummings model describes the system of a two-level atom which is interacting with a photon field in a quantum-mechanical framework. We present a Rabi-type experiment that tests this model. Our system comprises the nuclear spin of protons in water and an oscillating magnetic field. We measured the spin-state transition with various numbers of electromagnetic-field quanta involved.
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Carina Killian (Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Kegelgasse 27, Vienna, 1030, Austria)04/07/2023, 21:00Poster
At very low energies, a light neutral particle above a horizontal surface can experience quantum reflection. The quantum reflection holds the particle against gravity and leads to gravitational quantum states (GQS). So far, GQS were only observed with neutrons as pioneered by Nesvizhevsky and his collaborators at ILL. However, the existence of GQS is predicted also for atoms.
The...
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Robert Waddy04/07/2023, 21:00Talk
The LEMING experiment aims to test the equivalence principle for second generation matter, using a cold muonium beam (bound $\mu^+ e^-$), where the inertial mass is dominated by the muon.
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The feasibility of such a measurement relies on measuring the gravitational deflection of a lifetime limited atomic beam.
The poster discusses the feasibility and developments towards using a Talbot-Lau... -
Joanna Peszka (ETH Zurich)04/07/2023, 21:00Poster
In the ALPHA Experiment, laser-cooling of beryllium ions has been introduced to sympathetically cool positrons [1], which is anticipated to increase antihydrogen production [2]. Beryllium ions are generated through Pulsed Laser Ablation [3] and are trapped in the same Penning-Malmberg trap utilized for trapping and preparing antiproton and positron plasmas for antihydrogen synthesis. Cold...
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Jesse Zhang (ETH Zürich)04/07/2023, 21:00Poster
Muonium ($M = \mu^+ + e^-$) is a purely leptonic exotic atom which can be used as an unique probe for New Physics through precision spectroscopy measurements or through a gravity measurement testing the weak equivalence principle on elementary antimatter. We are developing a novel M source based on stopping accelerator muons in a layer of superfluid helium at cryogenic temperatures.
In this...
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Lucas de Sousa Borges (ETHZ IPA)04/07/2023, 21:00Poster
We present a novel technique for in-vacuum cavity-enhanced UV spectroscopy that allows nearly continuous measurements over several days, minimizing mirror degradation caused by high-power UV radiation. Our method relies on pulsing of the cavity's internal power, which increases the UV intensity to maximum only for short periods when the studied atom is within the cavity mode volume while...
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Mr Francesco Lancellotti04/07/2023, 21:00Poster
I will describe work performed on a Paul trap where we have demonstrated splitting and merging of mixed-species ion chains containing beryllium and calcium ions. These have a large mass ratio of > 4, which presents a number of complications, including decoupling of motional modes and large differences in mode frequencies, which primarily result from the difference in pseudo potential...
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Katharina von Schoeler04/07/2023, 21:00Poster
Precision measurements of nuclear charge radii provide important inputs for modern nuclear theory, helping to improve our understanding of nuclear forces. The spectroscopy of muonic atoms is known as a highly precise method for such measurements. However, in the case of low- to medium-Z nuclei, the covered energy range has so far been difficult to access using laser spectroscopy or...
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Patrick Strasser (KEK)04/07/2023, 21:00Poster
uonic helium is a hydrogen-like atom composed of a helium atom with one of its electrons replaced by a negative muon. Its ground-state hyperfine structure (HFS), resulting from the interaction of the remaining electron and the negative muon magnetic moment, is very similar to muonium but inverted. High-precision measurements of the muonium ground-state HFS interval are recognized as the most...
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Nick Schwegler (ETH Zurich), Mr Fabian Schmid (ETH Zurich)04/07/2023, 21:00Poster
The complexity and variety of molecules offer promising applications in metrology and quantum information that go beyond what is possible with atomic systems. We aim to study light molecular ions that are amongst the most fundamental and simplest molecules. Their internal structure can be calculated, making them prime candidates for the determination of fundamental constants as well as for...
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Claudio Lenz Cesar (Federal University of Rio de Janeiro (BR))05/07/2023, 08:20
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Yonit Hochberg (Hebrew University)05/07/2023, 08:25Talk
The exploration of dark matter beyond the standard lore is of vital importance towards resolving the identity of dark matter. I will discuss new proposals for the direct detection of light dark matter which hold much promise. These include the use of superconducting nanowires, two-dimensional targets such as graphene, and heavy fermion materials. Considering dark matter interactions with these...
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Hendrik Bekker05/07/2023, 09:00Talk
Axionlike particles (ALPs) are candidates for dark matter that are strongly motivated by theory and are searched for in a plethora of experiments. At the Cosmic Axion Spin Precession Experiments (CASPEr) we exploit techniques based on nuclear magnetic resonance spectroscopy to probe possible non-gravitational couplings between dark matter and ordinary matter. This allows for sensitivity to...
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David B Cassidy05/07/2023, 09:35Talk
Studies of the matter-antimatter system known as positronium are inherently quantum insofar as they involve an exotic atom that can decay into photons, and whose properties are for all practical purposes fully described by quantum electrodynamics. As a result, it is very easy to get involved in the new game of adding the word “quantum” to things that do not need or even deserve it. As such I...
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Michael Doser (CERN)05/07/2023, 10:40Talk
Antiprotonic atoms have been produced since the 1980's, but recent developments of laser-controlled controlled charge exchange processes in Penning traps have opened up a wide range of new physics topics. This talk will address several of these, whose physics reach ranges from atomic cascades within antiprotonic Rydberg atoms, a new production method of trapped, cold, fully stripped...
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giovanni carugno (INFN)05/07/2023, 11:15Talk
The QUest for Axion (QUAX) is a direct-detection CDM axion search which reaches the sensitivity necessary for the detection of galactic QCD-axion in the range of frequency 8.5-11 GHz.
The QUAX collaboration is operating two haloscopes, located at Padova/LNL- and LNF-INFN laboratories in Italy, that work in synergy and operate in different mass ranges.
In this talk we will report about...
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Philipp Johann Uhrich (Università di Trento)05/07/2023, 11:50Talk
The search for a quantum theory of gravity has led to the discovery of quantum many-body systems that are dual to gravitational models with quantum properties. The perhaps most famous of these systems is the Sachdev--Ye--Kitaev (SYK) model. It features maximal scrambling of quantum information, and opens a potential inroad to experimentally investigating aspects of quantum gravity. A scalable...
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Michael Doser (CERN)06/07/2023, 08:25
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Nicola Alexandra Reiter (ETH Zurich)06/07/2023, 08:30Talk
Quantum gases coupled to high-finesse optical resonators are a versatile platform to simulate many-body quantum systems, offering a high degree of experimental control. All-to-all interactions between the atoms naturally arise in such systems from the coupling of the atoms to a cavity mode, while cavity leakage facilitates real-time access to the dynamics of this open quantum system.
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Here, we... -
Simon Hertlein (ETH Zurich)06/07/2023, 08:55Talk
The time evolution of an quantum system can be strongly affected by dissipation. Although this mainly implies that the system relaxes to a steady state, in some cases it can bring to the appearance of new phases and trigger emergent dynamics. In our experiment, we study a Bose- Einstein Condensate dispersively coupled to a high finesse resonator. The cavity is pumped via the atoms, such that...
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Damian Goeldi06/07/2023, 09:20Talk
The LEMING experiment aims to test weak equivalence in leptonic antimatter. We will employ atomic interferometry to measure the vertical deviation of a horizontal cold muonium beam. Generation of cold muonium requires the experiment to operate well below 1K. Therefore, particle detectors operating reliably at these temperatures are crucial. We have successfully achieved sub-kelvin operation of...
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Massimiliano Rossi (ETH Zurich)06/07/2023, 09:45Talk
A nanosphere levitated in electromagnetic fields is a promising testbed for physics at the interface between the classical and the quantum realm. Recently, levitated particles have attracted attention as potential gravity quantum sources due to their large mass, ranging from $10^9$ to $10^{12}$ amu. A prerequisite to test the quantization of the gravitation field is, however, to prepare the...
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Florian Michael Piegsa, Ivo Schulthess (University of Bern)06/07/2023, 10:40Talk
The neutron represents a versatile tool in the realm of fundamental particle physics. It is used to perform precision physics measurements at low energies with the goal to search for beyond Standard Model signals. In this presentation, we will introduce activities currently pursued at the University of Bern. The projects encompass the hunt for a CP-violating neutron electric dipole moment...
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Martin Fertl (Johannes Gutenberg-Universität Mainz)06/07/2023, 11:15Talk
Precision measurements of $\beta-$decay spectra can provide exquisitely sensitive tests of various predictions and underlying symmetry assumptions of the Standard Model (SM) of Particle Physics. Hypothetical scalar- and tensor-type interactions can alter the shape of the $\beta-$decay spectrum across the full energy range, while the finite masses of neutrinos mostly alter its shape around the...
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Tilman Zibold06/07/2023, 11:50Talk
In 1935, Einstein, Podolsky, and Rosen (EPR) conceived a Gedankenexperiment which became a cornerstone of quantum technology and still challenges our understanding of reality and locality today. While the experiment has been realized with small quantum systems, a demonstration of the EPR paradox with massive many-particle systems remains an important challenge, as such systems are particularly...
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Prof. Thomas Udem06/07/2023, 16:00
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David Leibrandt (NIST/UCLA)06/07/2023, 16:05Talk
The extreme precision and accuracy of state-of-the-art optical atomic clocks can be used to look for very small deviations from the predictions of the Standard Model, offering a tool to search for beyond Standard Model (BSM) physics complementary to particle accelerators. These searches are based on measuring the frequency ratio of two transitions that depend differently on interactions with...
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Sven Sturm (Max Planck Society (DE))06/07/2023, 16:40Talk
Experiments with single ions confined in a Penning trap enable access to a broad range of observables that are of fundamental importance for our understanding of fundamental physics. In the magnetic field of the trap, the cyclotron frequency of an ion can be determined with unique precision and gives direct access to the charge-to-mass ratio. Furthermore, we have access to the gyromagnetic...
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Xing Fan06/07/2023, 17:45Talk
A single isolated electron in a Penning trap yields a new measurement of the electron magnetic moment g/2 = 1.001 159 652 180 59 (13).
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A comparison of the measured g-factor and the predicted g-factor using an independent measurement of the fine structure constant provides the most stringent test of the Standard Model.
The newly constructed system used for this measurement which resulted in... -
Dr Diana Prado Lopes Aude Craik (ETH Zürich/MIT)06/07/2023, 18:20Talk
I will present recent results of a search for new physics using isotope-shift spectroscopy of $\text{Yb}^+$ ions at MIT [1,2], and plans for IS spectroscopy experiments in $\text{Ca}^+$ at ETH Zurich. Recently, IS spectroscopy of atoms and ions has been proposed as a method to search for a new force between the neutron and the electron, mediated by a hypothetical dark-matter-candidate boson in...
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Mr Elmer Grundeman (Vrije Universiteit Amsterdam)06/07/2023, 18:45Talk
Precision spectroscopy of the 1S-2S transition in singly-ionized hydrogen-like helium is a promising avenue to test bound-state quantum electrodynamics. Additionally, combined with measurements on $\mu$He$^+$ [1], nuclear size effects and the nuclear polarizability can be probed [2]. He$^+$ can be confined in a Paul trap and sympathetically cooled by laser-cooled Be$^+$, which also serves as...
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Eberhard Widmann (Austrian Academy of Sciences (AT))07/07/2023, 08:25
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Claudio Lenz Cesar (Federal University of Rio de Janeiro (BR))07/07/2023, 08:30
I will discuss laser spectroscopy, particularly on the 1S-2S transition, of Hydrogen (H) and Antihydrogen (Hbar). The study of H recalls the work done at MIT in mid 90's and the setup under construction at UFRJ. The work with Hbar is done at the ALPHA collaboration at CERN. Details on line shapes, transition rates, detection schemes, will be discussed. The work has intimate connection to...
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Pauline Yzombard07/07/2023, 09:05
I will present the 1S-3S spectroscopy campaign we carried on Deuterium atoms during the winter 2020, using our home-made CW 205 nm laser. After discussing some main systematics effects and a newly discovered one, affecting our beam-line, I will present the latest analysis results.
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Gloria Clausen (ETH Zürich)07/07/2023, 09:30
The metastable He ((1s)$^1$(2s)$^1$) atom in its singlet ($^1$S$_0$) or triplet ($^3$S$_1$) states is an ideal system to perform tests of ab-initio calculations of two-electron systems that include quantum-electrodynamics and nuclear finite-size effects. The recent determination of the ionization energy of the metastable
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$2\,^1$S$_0$ state of $^4$He [1] confirmed a discrepancy between the... -
Dr Nancy Paul (Laboratoire Kastler Brossel (FR))07/07/2023, 10:25
Despite decades of effort, quantum electrodynamics (QED), the field theory that describes the interaction between light and charged particles, is poorly tested in the regime of strong coulomb fields. This is due to a confluence of difficulties linked to experimental limitations in highly-charged ion spectroscopy and nuclear uncertainties. I will present a new paradigm for probing higher-order...
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Franziska Hagelstein (JGU Mainz & PSI)07/07/2023, 11:00
I would like to discuss the theory of light muonic atoms, in particular, the two-photon-exchange polarizability contributions to the Lamb shift and hyperfine splitting in muonic hydrogen from baryon chiral perturbation theory and the two-photon-exchange contribution to the Lamb shift in muonic deuterium from pionless effective field theory. A focus will be on the ground-state hyperfine...
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Yuri van der Werf07/07/2023, 11:25
Precision measurements on calculable systems are commonly used for tests of highly involved quantum electrodynamics (QED) calculations and are sensitive probes for the discovery of new and unexplored areas of physics. In our experiment we apply laser cooling and trapping techniques on helium atoms, to perform a highly accurate measurement on the doubly forbidden 23S1 – 21S0 transition at 1557...
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Dr Yevgeny Stadnik (The University of Sydney)07/07/2023, 11:50
Ultralight scalar dark matter may induce apparent oscillations of the fundamental constants of nature and particle masses, including the muon mass. Oscillations in the muon mass may be directly probed via temporal shifts in the spectra of muonium and muonic atoms. Existing datasets and ongoing spectroscopy measurements with muonium are capable of probing scalar-muon interactions that are up to...
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Paolo Crivelli (ETH Zurich (CH))
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Mikhail Yaushev (The Lebedev Physical Institute of the Russian Academy of Sciences)Poster
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia
Cold atoms have many applications in quantum sensors and quantum simulations. Most studies in this field are performed in the so-called cycle mode, where stages of experiment are performed sequentially. Due to the rapid progress in laser systems, funda- mentally different schemes with spatial separation and...
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Artem Golovizin (P.N. Lebedev Physical Institute)Poster
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia
Optical clocks are one of the most precise instruments today with applications ranging from tests of fundamental physics to relativistic geodesy. The 1.14 μm clock transition in neutral thulium has exceptionally low sensitivity to the environment, including electric and magnetic fields and blackbody...
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