A5004053760- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Quantum many-body systems
- Quantum Information and Cryptography
- Advanced Frequency and Time Standards
- Atomic and Molecular Physics
- Physics of Superconductivity and Magnetism
- Quantum optics and atomic interactions
- Dark Matter and Cosmic Phenomena
- Mass Spectrometry Techniques and Applications
- Opinion Dynamics and Social Influence
- Laser Design and Applications
- Electrohydrodynamics and Fluid Dynamics
- Minerals Flotation and Separation Techniques
- Advanced Thermodynamics and Statistical Mechanics
- Strong Light-Matter Interactions
- Advanced Fiber Laser Technologies
- Sports Analytics and Performance
- Quantum Mechanics and Applications
- Gaussian Processes and Bayesian Inference
University of Oxford
2017-2024
We outline the experimental concept and key scientific capabilities of AION (Atom Interferometer Observatory Network), a proposed programme using cold strontium atoms to search for ultra-light dark matter, explore gravitational waves in mid-frequency range between peak sensitivities LISA LIGO/Virgo/ KAGRA/INDIGO/Einstein Telescope/Cosmic Explorer experiments, probe other frontiers fundamental physics. would complement planned searches as well mergers involving intermediate-mass black holes...
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
Abstract Progress in understanding quantum systems has been driven by the exploration of geometry, topology, and dimensionality ultracold atomic systems. The NASA Cold Atom Laboratory (CAL) aboard International Space Station enabled study bubbles, a terrestrially-inaccessible topology. Proof-of-principle bubble experiments have performed on CAL with an radiofrequency-dressing technique; alternate technique (dual-species interaction-driven bubbles) also proposed. Both techniques can drive...
We present the first experimental demonstration of a multiple radio-frequency dressed potential for configurable magnetic confinement ultracold atoms. load cold $^{87}\mathrm{Rb}$ atoms into double-well with an adjustable barrier height, formed by three radio-frequencies applied to in static quadrupole field. Our approach gives precise control over characteristics, including depth individual wells and height barrier, enables reliable transfer between available trapping geometries....
We probe local phase fluctuations of trapped two-dimensional Bose gases using matter-wave interferometry. This enables us to measure the correlation function, which changes from an algebraic exponential decay when system crosses Berezinskii-Kosterlitz-Thouless (BKT) transition. determine temperature dependence BKT exponent η and find critical value η_{c}=0.17(3) for our system. Furthermore, we vortex density as a function phase-space density, shows scale-invariant behavior across Our...
This paper outlines the centralized design and production of ultra-high-vacuum sidearm laser-stabilization systems for AION Ultra-Cold Strontium Laboratories. Commissioning data on residual gas steady-state pressures in chambers, magnetic field quality, laser stabilization, loading rate 3D magneto-optical trap are presented. Streamlining stabilization enabled Collaboration to build equip parallel five state-of-the-art Laboratories within 24 months by leveraging key expertise collaboration....
While renormalization group theory is a fully established method to capture equilibrium phase transitions, the applicability of RG universal non-equilibrium behavior remains elusive. Here we address this question by measuring dynamics triggered quench from superfluid thermal across Berezinskii-Kosterlitz-Thouless transition in 2D Bose gas. We system splitting gas two and probe relaxation correlation function vortex density via matter-wave interferometry. The occur two-step process rapid...
Techniques to manipulate the individual constituents of an ultracold mixture are key investigating impurity physics. In this work, we confine a hyperfine ground states Rb-87 in double-well potential. The potential is produced by dressing atoms with multiple radiofrequencies. amplitude and phase each frequency component field individually controlled independently species. Furthermore, verify that our collisionally stable, no observable inelastic loss.
Abstract We apply three machine learning strategies to optimize the atomic cooling processes utilized in production of a Bose–Einstein condensate (BEC). For first time, we both laser and evaporative mechanisms simultaneously. present results an evolutionary optimization method (differential evolution), based on non-parametric inference (Gaussian process regression) gradient-based function approximator (artificial neural network). Online is performed using no prior knowledge apparatus,...
Investigating out-of-equilibrium dynamics with two-dimensional (2D) systems is of widespread theoretical interest, as these are strongly influenced by fluctuations and there exists a superfluid phase transition at finite temperature. In this work, we realise matter-wave interference for degenerate Bose gases, including the first demonstration coherent splitting 2D gases using magnetic trapping potentials. We improve fringe contrast imaging only thin slice expanded atom clouds, which will be...
Methods to manipulate the individual constituents of an ultracold quantum gas mixture are essential tools for a number applications, example direct simulation impurity physics. We investigate scheme in which species-selective control is achieved using magnetic potentials dressed with multiple radiofrequencies, exploiting different Land\'e g-factors constituent atomic species. describe two frequencies, where atoms confined harmonic controllable degree overlap between This then extended four...
The understanding of nonequilibrium dynamics in many-body quantum systems is a fundamental issue statistical physics. Experiments that probe universal properties these can address such foundational questions. In this study, we report the measurement triggered by quench from superfluid to normal phase across Berezinskii-Kosterlitz-Thouless transition two-dimensional (2D) Bose gas. We reduced density splitting 2D gas two, realizing critical point. subsequent relaxation were probed with...
We dress atoms with multiple-radiofrequency fields and investigate the spectrum of transitions driven by an additional probe field. A complete theoretical description this rich is presented, in which we find allowed determine their amplitudes using resolvent formalism. Experimentally, observe up to sixth order field radiofrequency spectroscopy Bose-Einstein condensates trapped single- multiple-radiofrequency-dressed potentials. excellent agreement between theory experiment, including...
The authors measure and characterise the inelastic loss that occurs when a mixture of Rubidium isotopes is dressed with radiofrequency radiation. large rate coefficients are explained through detailed quantum scattering calculations.
This paper outlines the centralised design and production of Ultra-High-Vacuum sidearm Laser-Stabilisation systems for AION Ultra-Cold Strontium Laboratories. Commissioning data on residual gas steady-state pressures in chambers, magnetic field quality, laser stabilisation, loading rate 3D Magneto-Optical Trap are presented. Streamlining stabilisation enabled Collaboration to build equip parallel five state-of-the-art Laboratories within 24 months by leveraging key expertise collaboration....
Progress in understanding quantum systems has been driven by the exploration of geometry, topology, and dimensionality ultracold atomic systems. The NASA Cold Atom Laboratory (CAL) aboard International Space Station enabled study bubbles, a terrestrially-inaccessible topology. Proof-of-principle bubble experiments have performed on CAL with an rf-dressing technique; alternate technique (dual-species interaction-driven bubbles) also proposed. Both techniques can drive discovery next decade...
AtomECS is a software package that efficiently simulates the motion of neutral atoms experiencing forces exerted by laser radiation, such as in magneto-optical traps and Zeeman slowers. The program implemented using Entity-Component-System pattern, which gives excellent performance, flexibility scalability to parallel computing resources. simulation has been verified comparison analytic results, extensively unit tested.