A5041549953- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Advanced Frequency and Time Standards
- Quantum Information and Cryptography
- Quantum, superfluid, helium dynamics
- Spectroscopy and Laser Applications
- Strong Light-Matter Interactions
- Advanced Fiber Laser Technologies
- Quantum many-body systems
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Semiconductor Lasers and Optical Devices
- Physics of Superconductivity and Magnetism
- Advanced MRI Techniques and Applications
- Laser Design and Applications
- Random lasers and scattering media
- Laser-Matter Interactions and Applications
- Orbital Angular Momentum in Optics
- Topological Materials and Phenomena
- Quantum Mechanics and Applications
- Quantum and electron transport phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Geophysics and Sensor Technology
- Theoretical and Computational Physics
Peking University
2015-2024
Optica
2019
Beihang University
2019
East China Normal University
2013-2016
Shanghai Institute of Optics and Fine Mechanics
1992-2014
Chinese Academy of Sciences
2011-2014
Ministry of Education of the People's Republic of China
2001-2006
Academia Sinica
1993
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...
In an effort to address integrability breaking in cold gas experiments, we extend the integrable hydrodynamics of 1d Lieb-Liniger model with two additional components representing population atoms first and second transverse excited states, thus enabling a description quasi-1d condensates. Collisions between different are accounted for through inclusion Boltzmann-type collision integral hydrodynamic equation. Contrary standard generalized hydrodynamics, our extended captures thermalization...
Abstract We summarise the discussions at a virtual Community Workshop on Cold Atoms in Space concerning status of cold atom technologies, prospective scientific and societal opportunities offered by their deployment space, developments needed before atoms could be operated space. The technologies discussed include atomic clocks, quantum gravimeters accelerometers, interferometers. Prospective applications metrology, geodesy measurement terrestrial mass change due to, e.g., climate change,...
The Einstein Gravity Explorer mission (EGE) is devoted to a precise measurement of the properties space-time using atomic clocks. It tests one most fundamental predictions Einstein's Theory General Relativity, gravitational redshift, and thereby searches for hints quantum effects in gravity, exploring important challenging frontiers physics. primary goal redshift with an accuracy up factor 104 higher than best current result. based on satellite carrying cold atom-based payload includes...
As in between liquid and crystal phases lies a nematic crystal, which breaks rotation with preservation of translation symmetry, there is superfluid phase bridging supersolid. The order also emerges interacting electrons has been found to largely intertwine multiorbital correlation high-temperature superconductivity, where Ising nematicity arises from four-fold symmetry ${C}_{4}$ broken down ${C}_{2}$. Here, we report an observation three-state (${\mathbb{Z}}_{3}$) quantum order, dubbed...
Radio frequency (RF) control is a key technique in cold atom experiments. Here, we present new design based on virtual load, where low-frequency coil with of up to 30\,MHz, functions as both an inductor and power-sharing element capacitive transformer circuit. This enables highly efficient RF circuit tunable matching bandwidth. It integrates broadband narrowband coils into compact configuration, overcoming the distance limitations metallic chambers. The system, tested 10-second evaporative...
We present a comprehensive analysis of the Landau-Zener tunneling nonlinear three-level system in linearly sweeping external field. find presence nonzero probability adiabatic limit (i.e., very slowly field) even for situation that term is small and energy levels keep same topological structure as linear case. In particular, irregular with showing an unresolved sensitivity on rate. For case fast-sweeping fields, we derive analytic expression stationary phase approximation show nonlinearity...
We present a method for the effective preparation of Bose-Einstein condensate (BEC) into excited bands an optical lattice via standing-wave pulse sequence. With our method, BEC can be prepared in either single Bloch state excited-band, or coherent superposition states different bands. Our scheme is experimentally demonstrated by preparing $^{87}$Rb $d$-band and $s$- one-dimensional lattice, within few tens microseconds. further measure decay state, carry analytical calculation collisional...
Ramsey interferometers (RIs) using internal electronic or nuclear states find wide applications in science and engineering. We develop a matter wave interferometer for motional quantum exploiting the S- D-bands of an optical lattice identify different de-phasing de-coherence mechanisms. implement band echo technique, employing repeated $\pi$-pulses. This suppresses evolution significantly increase coherence time state by one order magnitude. thermal fluctuations as main mechanism remaining...
Sliding phases have been long sought after in the context of coupled XY-models, as they are relevance to various many-body systems such layered superconductors, freestanding liquid-crystal films, and cationic lipid-DNA complexes. Here we report an observation a dynamical sliding phase superfluid that emerges nonequilibrium setting from quantum dynamics three-dimensional ultracold atomic gas loaded into P-band one-dimensional optical lattice. A shortcut loading method is used transfer atoms...
In this paper, we investigate the effects of spontaneously generated coherence (SGC) on conditions for exhibiting lasing without inversion (LWI) in presence a weak probe and strong-coupling field. We find that owing to effect SGC, LWI can be realized incoherent pumping or decay between two upper levels. However, region where exhibited, SGC term exhibition is not always positive, sometimes it even cumber realization some values SGC. These are given paper. addition, also analyze essence generation
Magic wavelengths for laser trapping of boson isotopes alkaline-earth metal atoms Sr, Ca, and Mg are investigated while considering terahertz clock transitions between the ${}^{3}{P}_{0}$, ${}^{3}{P}_{1}$, ${}^{3}{P}_{2}$ metastable triplet states. Our calculation shows that magic do exist. This result is important because those states have already been used to make accurate clocks in frequency domain. Detailed discussions given this article.
We investigate the collective excitations of a one-dimensional Bose-Einstein condensate with repulsive interaction between atoms in quadratic plus quartic trap. Using variational approaches, coupled equations motions for center-of-mass coordinate and its width are derived. Then, two low-energy excitation modes obtained analytically. The frequency shift induced by anharmonic distortion, collapse revival originating from nonlinear coupling modes, discussed.
A new signal-processing method based on an electronic frequency down-conversion technique has been introduced into a sinusoidal phase-modulating, self-mixing interferometer. The developed interferometer employs electro-optical crystal placed in the external cavity of He–Ne laser to generate phase modulation with high rate and ultralow insertion loss. Phase quadrature signals which have amplitude-modulated by sine cosine functions, respectively, measured displacement can be extracted from...
We report the first experimental observation of strong suppression matter-wave superradiance using blue-detuned pump light and demonstrate a pump-laser detuning asymmetry in collective atomic recoil motion. In contrast to all previous theoretical frameworks, which predict that process should be symmetric with respect sign laser from one-photon resonance, we find for condensates symmetry is broken. With high condensate densities red-detuned distinctive multiorder, scattering pattern clearly...
We report the long-time nonlinear dynamical evolution of ultracold atomic gases in $P$ band an optical lattice. A Bose-Einstein condensate is fast and efficiently loaded into at zero quasimomentum with a nonadiabatic shortcut method. For first 1.5 ms, this momentum state undergoes oscillations due to coherent superposition different bands, which are followed by up 60 ms much longer period. Our analysis shows dephasing from interaction very conducive long-period induced variable force...
Fiber-based optical frequency combs, characterized by compact configuration and outstanding properties, have been developed into state-of-the-art precision instruments which are no longer used just for metrology, but a number of applications, including clocks, attosecond science, exoplanet searches, medical diagnostics, physicochemical processes control advanced manufacturing. This short perspective presents some the milestones highlights in evolution fiber-based combs technical revolution...
We report the observation of quantum dynamical oscillations ultracold atomic gases in $F$ and $D$ bands an ordinary optical lattice. are able to control Bragg reflections at Brillouin-zone edge up third order. As a result, we can switch dynamics from across both only within band. Our capability observe these comes nonadiabatic technique which allows us load atoms efficiently $G$ band
The ultracold atoms in a moving optical lattice with its high controllability is feasible platform to research the transport phenomenon. Here, we study process of at D band one-dimensional lattice, and perform manipulation atomic by modulating population proportion S band. In experiment, first load into using shortcut method, then accelerate scanning phase beams. demonstrated respectively. We find group velocity opposite that By doping band, superposition state modulated, from positive...
The dimensional crossover induces varieties of quantum phenomena. In this paper, we demonstrate the critical dynamics under involving many-body phase transitions by continuously suppressing correlations and tunnelings along one direction bulk materials, which provides a smooth connection from higher dimensions to lower ones based on intrinsic rather than geometry tailoring. By measuring nonadiabatic excitations, scaling laws in both three two are observed consistent with predictions....
Atoms with narrow-linewidth transition trapped within the Lamb-Dick regime of optical lattice are proposed be used as laser gain medium to build a laser. The atoms can alkaline-earth species, Magnesium, Calcium, and Strontium, including Ytterbium. These possess promising super-narrow clock transitions, but here, this is lasing output This expected linewidth an active high accuracy stability.