Article
Quantum Science & Technology
Zeyang Li, Boris Braverman, Simone Colombo, Chi Shu, Akio Kawasaki, Albert F. Adiyatullin, Edwin Pedrozo-Penafiel, Enrique Mendez, Vladan Vuletic
Summary: In a high-finesse optical cavity, the interaction between an atomic ensemble and a light mode easily reaches the strong-coupling regime, where quantum effects dominate. This interaction can generate both atom-light and atom-atom entanglement, and conditions are determined to maximize the entanglement-induced gain in quantum sensors and atomic clocks.
Article
Physics, Multidisciplinary
Xingchang Wang, Jianmin Wang, Ying Zuo, Liang Dong, Georgios A. Siviloglou, Jiefei Chen
Summary: The researchers experimentally demonstrated a new spin wave thermometry method that can measure the temperature of a cold atomic ensemble optical quantum memory. This technique is highly suitable for probing the atomic motion in elongated clouds, which are commonly used in quantum memories, and can provide comparable precision for different types of memories.
Article
Multidisciplinary Sciences
Philip Thomas, Leonardo Ruscio, Olivier Morin, Gerhard Rempe
Summary: This article introduces a deterministic protocol for creating photonic entanglement with a single memory atom in a cavity. By interleaving controlled single-photon emissions with tailored atomic qubit rotations, it is possible to efficiently grow multi-photon GHZ states and linear cluster states.
Article
Physics, Multidisciplinary
Juraj Hasik, Maarten Van Damme, Didier Poilblanc, Laurens Vanderstraeten
Summary: Starting from a simple spin-1/2 chiral frustrated Heisenberg model, it has been shown that a faithful representation of the chiral spin liquid phase is possible using a generic PEPS through variational optimization. This representation includes a perfectly chiral gapless edge mode and rapid decay of correlation functions at short distances, consistent with a bulk gap, along with a gossamer long-range tail originating from PEPS bulk-edge correspondence.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Qi Liu, Tian -Wei Mao, Ming Xue, Ling-Na Wu, Li You
Summary: We propose an efficient nonlinear readout scheme for entangled non-Gaussian spin states using the intrinsic quasicyclic dynamics of interacting spin-21 systems. By studying the twist-and-turn (TNT) and two-axis-countertwisting (TACT) spin models, we find that the optimal metrological gain almost saturates the quantum Cramer-Rao bound (QCRB) and follows the Heisenberg scaling. This approach presents a practical way to achieve high-precision and detection-noise-robust quantum metrology with entangled non-Gaussian spin states.
Article
Physics, Applied
Yajun Wang, Wenhui Zhang, Ruixin Li, Long Tian, Yaohui Zheng
Summary: In a CV-QKD system, a bias of two entanglement quadratures may degrade the secret key rate and distance, but generating unbiased entangled states could greatly enhance the key rate and secure distance for secure communication.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Jose D. Mella, Hernan L. Calvo, Luis E. F. Foa Torres
Summary: This report discusses the effects of electron-phonon interaction in materials, particularly in graphene. It shows that this interaction can lead to the formation of a gap bridged by unique edge states, with a distinctive locking among propagation direction, valley, and phonon mode. These findings shed light on how to utilize these unconventional states in quantum research.
Article
Optics
Yijie Shen, Isaac Nape, Xilin Yang, Xing Fu, Mali Gong, Darryl Naidoo, Andrew Forbes
Summary: This research demonstrates the creation and full control of vectorially structured light in eight dimensions, controlling a complete set of classical Greenberger-Horne-Zeilinger (GHZ) states for the first time. It also introduces a new tomography method to verify the fidelity of these states, opening up new pathways for extending the dimensionality and degrees of freedom of vectorially structured light in both classical and quantum regimes.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Quantum Science & Technology
Giuseppe Vitagliano, Matteo Fadel, Iagoba Apellaniz, Matthias Kleinmann, Bernd Lucke, Carsten Klempt, Geza Toth
Summary: This article presents a method to detect bipartite entanglement using number-phase-like uncertainty relations in split spin ensembles. An uncertainty relation is derived for spin systems, which allows for the detection of bipartite entanglement in an unpolarized Dicke state of many spin1/2 particles. The method involves splitting the particles into two subensembles and conducting collective angular momentum measurements locally on each part.
Article
Quantum Science & Technology
Jinhyuk Bae, Jiho Park, Ye Jin Yu, Heung-Ryoul Noh, Han Seb Moon
Summary: It is demonstrated that the polarization-entangled photon-pair sources from atomic ensembles can be controlled using an external magnetic field, thereby optimizing the entangled state.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Optics
Xihua Yang, Junxiang Zhang, Jingping Xu, Ligang Wang
Summary: We propose a convenient and efficient scheme to generate multipartite continuous-variable entanglement via mechanical oscillator displacement induced by two strong input pump fields in a conventional single-cavity optomechanical system. This method has promising applications in realistic quantum communication and networks.
Article
Optics
Lifu Zhang, Jie Jiang, Christian Multunas, Chen Ming, Zhizhong Chen, Yang Hu, Zonghuan Lu, Saloni Pendse, Ru Jia, Mani Chandra, Yi-Yang Sun, Toh-Ming Lu, Yuan Ping, Ravishankar Sundararaman, Jian Shi
Summary: Researchers demonstrate a persistent spin helix in an organic-inorganic hybrid ferroelectric halide perovskite. They show that the spin-polarized band structure can be switched via an intrinsic ferroelectric field. This discovery has the potential to resolve the control-relaxation dilemma in spintronic devices.
Article
Optics
Jia-Ming Cheng, Zheng-Wei Zhou, Guang-Can Guo, Han Pu, Xiang-Fa Zhou
Summary: In this study, we investigate a hybrid atom-optomechanical system composed of a mechanical membrane and an atomic Bose-Einstein condensate. By deriving the cavity-mediated effective atom-atom interaction potential, we observe the breaking of system symmetry and emergence of new quantum phases and phase transitions. When long-range interactions dominate, the condensate transitions into a self-organized lattice-like state with increasing particle densities, disrupting translation symmetry. This system serves as a platform to explore self-organized phenomena induced by long-range interactions.
Article
Optics
Xuejing Liu, Yang LI, Chenhui Zhang, Yanhui Hu
Summary: The determination of electron spin polarization is proposed based on controlling the atomic population distributions of ground states. The polarization is deduced by generating different population symmetries using polarized lights. The feasibility of the method is validated through theoretical and experimental analysis. The influences of relaxation and magnetic fields are also investigated, along with the effects of pump rates and ellipticity of lights. The in-situ polarization measurement without changing the optical path of the atomic magnetometer provides a new approach for evaluating its performance and monitoring the hyperpolarization of nuclear spins.
Article
Materials Science, Multidisciplinary
Tommaso Comparin, Alvin Opler, Elia Macaluso, Alberto Biella, Alexios P. Polychronakos, Leonardo Mazza
Summary: In this study, we propose a spin for localized quasiparticle excitations of lowest-Landau-level quantum Hall states defined on a disk. The spin we propose satisfies the spin-statistics relation and can be used to reconstruct the topological geometric phase associated with the exchange of two arbitrarily chosen quasiparticles. It is related to the quadrupole moment of the quasiparticle charge distribution and can be measured in experiments, providing complementary information to current interferometric schemes.
Article
Optics
Yunfei Wang, Yuqing Li, Jizhou Wu, Wenliang Liu, Jiazhong Hu, Jie Ma, Liantuan Xiao, Suotang Jia
Summary: The study focuses on the Bose-Einstein condensation of Cs-133 atoms and a hybrid evaporative cooling method combining magnetically tunable evaporation with optical evaporation. The experimental results are in excellent agreement with the equation model for evaporative cooling.
Article
Physics, Multidisciplinary
Julius de Hond, Jinggang Xiang, Woo Chang Chung, Enid Cruz-Colon, Wenlan Chen, William Cody Burton, Colin J. Kennedy, Wolfgang Ketterle
Summary: This study examines a special ground state of bosons with two spin states in an optical lattice - the spinMott insulator. This state is composed of repulsively bound pairs and is insulating for both spin and charge transport. One of the decay regimes observed exhibits protection by the pairing gap.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Ye Tian, Zhongchi Zhang, Jilai Ye, Yajuan Zhao, Jiazhong Hu, Wenlan Chen
Summary: We design, build, and calibrate an integrated quantum gas microscope that provides high-resolution imaging of spatial distributions of cold atoms. By fixing all the optical components outside the vacuum chamber, our microscope offers a large numerical aperture and good optical access for atom loading. Furthermore, the special design of the vacuum viewport suppresses window flatness distortion and protects high-resolution imaging from distortions.
Article
Multidisciplinary Sciences
Libo Liang, Wei Zheng, Ruixiao Yao, Qinpei Zheng, Zhiyuan Yao, Tian-Gang Zhou, Qi Huang, Zhongchi Zhang, Jilai Ye, Xiaoji Zhou, Xuzong Chen, Wenlan Chen, Hui Zhai, Jiazhong Hu
Summary: The article presents a novel method of probing quantum many-body correlation by ramping dynamics. The researchers demonstrate this method experimentally by studying the Bose-Hubbard model with ultracold atoms in three-dimensional optical lattices. This method provides important insights into the physical properties of quantum systems.
Article
Optics
Libo Liang, Yuqing Wang, Qi Huang, Qinpei Zheng, Xuzong Chen, Jiazhong Hu
Summary: Manipulating ultracold atoms in optical lattices is an optimal method to observe phase transitions of the useful Hubbard model. Bosonic atoms in this model undergo a phase transition from superfluids to Mott insulators by adjusting systematic parameters. However, in conventional setups, phase transitions occur over a wide range of parameters due to the Gaussian shape of the optical lattice lasers. To accurately detect the phase transition point in our lattice system, we use a blue-detuned laser to compensate for the local Gaussian geometry. By examining the change in visibility, we find a sudden jump point at a specific trap depth of the optical lattice, corresponding to the first appearance of Mott insulators in inhomogeneous systems. This provides a simple method to detect the phase transition point in such systems, and it is expected to be a useful tool for cold atom experiments.
Article
Physics, Applied
Shuai Wang, Wenjun Zhang, Tao Zhang, Shuyao Mei, Yuqing Wang, Jiazhong Hu, Wenlan Chen
Summary: We design an integrated measurement and feedback system to quickly assemble defect-free atomic arrays using maximum parallelism. By processing atom detection, occupation analysis, strategy formulation, and signal generation in parallel, we reduce the rearrangement time cost. Additionally, we propose an alternative algorithm, the Tetris algorithm, to reassemble atoms to arbitrary target geometries.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Meng Ye, Ye Tian, Jian Lin, Yuchen Luo, Jiaqi You, Jiazhong Hu, Wenjun Zhang, Wenlan Chen, Xiaopeng Li
Summary: This study demonstrates the universality of the atom cavity system for quantum optimization with arbitrary connectivity, achieving programmability by placing atoms at different positions in the cavity. The system can efficiently encode and solve number partition problems and quadratic unconstrained binary optimization problems. These results suggest that the atom cavity system is a promising quantum optimization platform.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
Yuqi Liu, Zhongchi Zhang, Shiwan Miao, Zihan Zhao, Huaichuan Wang, Wenlan Chen, Jiazhong Hu
Summary: We propose a theoretical model to calibrate the absorption imaging of cold atoms under high magnetic fields. Our model can account for many experimental imperfections and accurately calculate the correction factor for atom-number measurement. We experimentally verify our model using a cold-atom apparatus based on 85Rb and find it can also serve as a benchmark to measure the polarization impurity of a circularly polarized laser beam with high sensitivity.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Qinpei Zheng, Yuqing Wang, Libo Liang, Qi Huang, Shuai Wang, Wei Xiong, Xiaoji Zhou, Wenlan Chen, Xuzong Chen, Jiazhong Hu
Summary: This paper demonstrates the quantum critical dynamics under dimensional crossover involving many-body phase transitions by continuously suppressing correlations and tunnelings along one direction of bulk materials, providing a smooth connection from higher dimensions to lower ones based on intrinsic correlations rather than geometry tailoring. Through measuring nonadiabatic excitations, the critical scaling laws in both three and two dimensions are observed and consistent with predictions. Furthermore, scaling behaviors for intermediate regimes with noninteger dimensions are found. This study provides insights to extend the descriptions of critical exponents into more general or complex scenarios.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Shiwan Miao, Zhongchi Zhang, Yajuan Zhao, Zihan Zhao, Huaichuan Wang, Jiazhong Hu
Summary: We propose a scheme to achieve bosonic fractional quantum Hall conductance in shaken honeycomb optical lattices. This scheme does not require a very flat band and utilizes common s-wave scattering for the necessary long-range interaction. By filling the lattice at 1/4 density under Feshbach resonance, two degenerate many-body ground states share a Chern number of 1, corresponding exactly to a fractional quantum Hall conductance of 1/2. Additionally, we demonstrate that the fractional quantum Hall state can be prepared by adiabatically turning on the lattice shaking, and the fractional conductance remains robust in the shaken lattice. This provides an easy method to initialize and prepare fractional quantum Hall states in ultracold-atom platforms, paving the way for studying and simulating strongly correlated quantum matters with degenerate quantum gases.
