A5024471569- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Mechanical and Optical Resonators
- Atomic and Subatomic Physics Research
- Photonic and Optical Devices
- Advanced Frequency and Time Standards
- Advanced optical system design
- Industrial Vision Systems and Defect Detection
- Advanced Fiber Laser Technologies
- Advancements in Photolithography Techniques
- Spectroscopy and Laser Applications
- Advanced Battery Materials and Technologies
- Neutrino Physics Research
- Particle Detector Development and Performance
- Laser-Plasma Interactions and Diagnostics
- Orbital Angular Momentum in Optics
- Thermodynamic and Structural Properties of Metals and Alloys
- Mitochondrial Function and Pathology
- Particle physics theoretical and experimental studies
- Advanced X-ray Imaging Techniques
- High-pressure geophysics and materials
- Random lasers and scattering media
- Spectroscopy and Quantum Chemical Studies
- Inorganic Chemistry and Materials
Shanxi University
2014-2024
State Key Laboratory of Quantum Optics and Quantum Optics Devices
2014-2024
Shanghai Institute of Optics and Fine Mechanics
2023
Chinese Academy of Sciences
2023
We experimentally demonstrate strong coupling between a one-dimensional (1D) single-atom array and high-finesse miniature cavity. The atom is obtained by loading single atoms into 1D optical tweezer with dimensions of 1×11. Therefore, deterministic number obtained, the determined imaging on CCD camera in real time. By precisely controlling position spacing high finesse Fabry-Perot cavity, all are strongly coupled to cavity simultaneously. vacuum Rabi splitting spectra discriminated for...
Optical nonreciprocity is important in photonic information processing to route the optical signal or prevent reverse flow of noise. By adopting strong nonlinearity associated with a few atoms strongly coupled cavity QED system and an asymmetric configuration, we experimentally demonstrate nonreciprocal transmission between two counterpropagating light fields extremely low power. The 18% achieved for forward field, maximum blocking ratio 30 dB. Though can be maximized by optimizing impedance...
Abstract Breaking the time‐reversal symmetry of light is great importance for fundamental physics and has attracted increasing interest in study non‐reciprocal photonic devices. Here, a chiral cavity quantum electrodynamics system with multiple atoms strongly coupled to Fabry–Pérot experimentally demonstrated. By polarizing internal state atoms, atom‐cavity interaction broken. The can be described by quasiparticles, that is, polariton. When it works linear regime, inherent nonreciprocity...
We developed a resolved Raman sideband cooling scheme that can efficiently prepare single optically trapped cesium (Cs) atom in its motional ground states. A two-photon process between two outermost Zeeman sublevels hyperfine state is applied to reduce the phonon number. Our less sensitive variation magnetic field than commonly used where belonging separate states are taken. Fast optical pumping with spontaneous emission guarantees efficiency of process. After for 50 ms, 82% Cs atoms...
Abstract The target backsheath field acceleration mechanism is one of the main mechanisms laser-driven proton (LDPA) and strongly depends on comprehensive performance ultrashort ultra-intense lasers used as driving sources. successful use SG-II Peta-watt (SG-II PW) laser facility for LDPA its applications in radiographic diagnoses have been manifested by good PW facility. Recently, has undergone extensive maintenance a technical upgrade terms seed source, contrast terminal focus. experiments...
Breaking the time-reversal symmetry of light is great importance for fundamental physics and has attracted increasing interest in study non-reciprocal photonic devices. Here, we experimentally demonstrate a chiral cavity QED system with multiple atoms strongly coupled to Fabry-Perot cavity. By polarizing internal quantum state atoms, atom-cavity interaction broken. The can be described by quasiparticles, i.e., polariton. When it works linear regime, inherent nonreciprocity makes work as...
We investigate the transmission of single-atom transits based on a strongly coupled cavity quantum electrodynamics system. By superposing transit transmissions considerable number atoms, we obtain absorption spectra induced by single atoms and temperature cold atom. The passing through microcavity for each release is also counted, this changes exponentially along with atom temperature. Monte Carlo simulations agree closely experimental results, initial determined. Compared conventional...
We present two long-working-distance objective lenses with numerical apertures (NA) of 0.29 and 0.4 for single-atom experiments. The are assembled entirely by the commercial on-catalog $\Phi$1'' singlets. Both objectives capable to correct spherical aberrations due standard flat vacuum glass windows various thickness. working distances NA$=0.29$ NA$=0.4$ 34.6 mm 18.2 mm, respectively, at design wavelength 852 nm 5-mm thick silica window. In addition, can also be optimized work diffraction...
A single neutral atom is one of the most promising candidates to encode a quantum bit (qubit). In real experiment, always confined in micro-sized far off-resonant optical trap (FORT). There are generally two types traps: red-detuned and blue-detuned trap. We experimentally compare qubits encoded "clock states" cesium atoms separately either 1064-nm (bright) or 780-nm (dark) trap: both traps have almost same depth. longer lifetime 117 s coherence time about 10 ms achieved dark This provides...
A new method to precisely measure the hyperfine spectra of a weak atomic transition line with very low probe power is presented by combining optical pumping and state detection techniques. By adopting such method, we demonstrate an experiment cesium 6S–7S two-photon optically trapped single atoms. The beam in our on micro-watt level corresponding intensity hundreds watts per square centimeter. Both are much weaker than that traditional fluorescence measurements. coupling constant Ahps 7S...
In a strongly coupled cavity quantum electrodynamics (QED) system, the second-order correlation function g (2) ( τ ) of transmitted probe light from is determined by nonlinearity atom in cavity. Therefore, system provides platform for controlling photon statistics manipulating nonlinearity. this paper, we experimentally demonstrate nonreciprocal QED with several atoms to an asymmetric optical cavity, which composed two mirrors different transmittivities. When direction reversed, intracavity...
We present two sets of versatile high-numerical-apeture objectives suitable for various cold-atom experiments. The are assembled entirely by the commercial on-shelf singlets. initially optimized at working wavelength 852 nm with a standard 5-mm silica optical flat window. They have numerical apertures NA=0.55 and NA=0.78, distances 23 12.8 mm, diffraction-limited fields view 98 15 μ m, spatial resolutions 0.94 0.67 respectively. These performances simulated ray-tracing software...
Abstract The fidelity of the gate operation and coherence time neutral atoms trapped in an optical dipole trap are figures merit for applications. motion atom is one key factors which influences time. has been considered as a classical oscillator analyzing influence. Here we treat quantum oscillator. population on vibrational states decoherence. We show that coherent rotation dramatically limited by temperature thermally atom. also dephasing between two hyperfine due to thermal could rephase...
Cavity quantum electrodynamic system with strongly coupled single atoms provides a good platform for studying information processing, simulation, network, and distributed computing. Cooling trapping is crucial technique in the technology. At present, high-finesse cavity finite space, cooling big challenge, even though it mature free space. Great efforts have been made to cool trap inside cavity, trapped atom its lifetime has reached as long tens of seconds. Developing more flexible method...
Single-photon source is an essential element in quantum information processing, and extensively used the proof-in-principle demonstration physics, imaging, cryptography, etc. Considering operating temperature system complexity, it a favorable option to choose spontaneous parametric down-conversion (SPDC) combined with enhancement effect of cavity. When generating significant single-photon via cavity-enhanced type-II method, there appears inevitable birefringence which obviously influences...
We developed a resolved Raman sideband cooling scheme that can efficiently prepare single optically trapped cesium (Cs) atom in its motional ground states. A two-photon process between two outermost Zeeman sublevels hyperfine state is applied to reduce the phonon number. Our less sensitive variation magnetic field than commonly used where belonging separate states are taken. Fast optical pumping with spontaneous emission guarantees efficiency of process. After for 50 ms, 82% Cs atoms...
We analyze the decoherence between two ground electronic states of an optically trapped atom by adopting a full description atomic wavefunction. The motional state, i.e., phonon is taken into account. In addition to due variance differential light shift (DLS), new mechanism, phonon-jumping-induced (PJID), discovered and verified experimentally. A coherence time $T_2\approx 20$ s then obtained for single Cs suppressing both variances DLS PJID trapping in blue-detuned BBT preparing its...