Article
Physics, Multidisciplinary
Ziliang Li, Zhengyu Gu, Zhenlian Shi, Pengjun Wang, Jing Zhang
Summary: We have developed a compact experimental setup to produce a quantum degenerate mixture of Bose Na-23 and Fermi K-40 gases. By using dual dark magneto-optical traps and the gray molasses technique, the atoms are efficiently collected and cooled. The resulting mixture consists of a degenerate Fermi gas of K-40 and a Bose-Einstein condensate of Na-23, with tunable population imbalance.
Article
Multidisciplinary Sciences
Yair Margalit, Yu-Kun Lu, Furkan Cagri Top, Wolfgang Ketterle
Summary: The phenomenon of Pauli blocking of light scattering in a dense quantum-degenerate Fermi gas of ultracold lithium atoms has been observed, with a 37% suppression of light scattered even at large angles at low temperatures compared to higher temperatures.
Article
Biochemistry & Molecular Biology
Jianjun Wang, Xi Zhang, Junbo Deng, Xing Hu, Yun Hu, Jiao Mao, Ming Ma, Yuhao Gao, Yingchun Wei, Fan Li, Zhaohua Wang, Xiaoli Liu, Jinyou Xu, Liqing Ren
Summary: In this study, a simplified near-degenerate four-wave-mixing microscopy (SNDFWM) was developed with advantages of simpler experimental apparatus, lower cost, and easier operation. The SNDFWM microscopy demonstrated high sensitivity and high spatial resolution in both nanowires and biological tissues, and showed potential for ultra-sensitive detection based on the electron-resonance effect, which could be useful in tracking nano drugs in vivo.
Article
Optics
Yaakov Yudkin, Paul S. Julienne, Lev Khaykovich
Summary: This article investigates the influence of the near degeneracy of two near-degenerate two-body continua on the few-body physics in ultracold collisions of bosonic lithium atoms. A minimal model with two atomic continua and one closed molecular channel is used for analysis, allowing the study of the spin composition of loosely bound dimers and trimers. The results show qualitative agreement with the well-established coupled-channel calculation phenomenology of lithium in the two-body sector, while the Efimov trimer energy levels in the three-body sector follow a different functional form compared to a single continuum scenario. The study suggests that the experimentally observed exotic behavior of the first excited Efimov energy level is most likely caused by the short-range details of the interaction potential.
Article
Optics
Yan-Peng Bai, Jing-Lun Li, Gao-Ren Wang, Zhong-Bo Chen, Bo-Wen Si, Shu-Lin Cong
Summary: This study presents a simple theoretical model that describes the suppressing reactivity of an ultracold Fermi molecular gas in a degenerate regime using the statistical potential. The model successfully reproduces the experimentally observed suppression of the chemical reaction rate and intuitively captures the strength of spatial correlation through the statistical potential.
Article
Astronomy & Astrophysics
Andrew Eberhardt, Alvaro Zamora, Michael Kopp, Tom Abel
Summary: The study examines the approximation of interacting Bosonic systems by classical fields as total occupation number increases, using a new parallel solver QIBS. Different toy models are tested to track quantum corrections in the classical field description, finding that only number eigenstates do not converge to classical evolution with increased occupation number. The scaling of the quantum breaktime depends on model interactions and initial conditions, with some systems exhibiting logarithmic enhancement and others showing power law enhancement.
Article
Optics
Kali E. Wilson, Alexander Guttridge, Jack Segal, Simon L. Cornish
Summary: Production of quantum degenerate Bose-Bose mixtures of Cs and Yb with both attractive and repulsive interspecies interactions is reported. Dual-species evaporation in a bichromatic optical dipole trap allows for efficient sympathetic cooling of Cs. For Cs + Yb-174, the attractive interspecies interaction is stabilized by repulsive intraspecies interactions, while for Cs + Yb-170(b), the repulsive interspecies interaction can overwhelm the intraspecies interactions, resulting in partial miscibility of the mixture.
Article
Quantum Science & Technology
Patrick Boegel, Alexander Wolf, Matthias Meister, Maxim A. Efremov
Summary: Motivated by the recent experimental realization of ultracold quantum gases in shell topology, we propose a straightforward implementation of matter-wave lensing techniques for shell-shaped Bose-Einstein condensates. This approach allows to significantly extend the free evolution time of the condensate shell after release from the trap and enables the study of novel quantum many-body effects on curved geometries. With both analytical and numerical methods we derive optimal parameters for realistic schemes to conserve the shell shape of the condensate for times up to hundreds of milliseconds.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Optics
Scott Lawrence, Paul Romatschke
Summary: Gravitational waves distort equilibrium matter globally and can be detected using laser interferometers. However, gravitational waves also create local nonequilibrium stresses inside matter, which could potentially lead to alternative detection methods. The gravitational wave-to-matter coupling coefficient K, which depends on the material, is poorly known for most substances. In this study, we calculate K for a superfluid Fermi gas near unitarity using large-N techniques and find K = n 12m, matching the result for free Dirac fermions at zero temperature. Our prediction can be tested theoretically and experimentally in a nonperturbative manner.
Article
Multidisciplinary Sciences
Bertrand Evrard, An Qu, Jean Dalibard, Fabrice Gerbier
Summary: In this study, a three-fragment condensate was produced for a mesoscopic spin-1 gas with anti-ferromagnetic interactions and vanishing collective spin. The reconstructed state was found to be close to the expected many-body ground state using spin-resolved detection, while one-body observables remained the same as for a completely mixed state. This highlights how the interplay between symmetry and interactions generates entanglement in a mesoscopic quantum system.
Article
Physics, Multidisciplinary
Timon A. Hilker, Lena H. Dogra, Christoph Eigen, Robert P. Smith, Zoran Hadzibabic
Summary: The two sounds in a highly compressible fluid are investigated using an ultracold Bose gas. The results show that only one sound persists at different temperatures, which is consistent with the hydrodynamic theory.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Clement Duval, Nicolas Cherroret
Summary: We theoretically study the non-equilibrium dynamics of a two-dimensional uniform Bose superfluid after a sudden quantum change, from its short-term coherent dynamics to long-term thermalization. By using a quantum hydrodynamic description and a Keldysh field formalism, we derive quantum kinetic equations for the low-energy phononic excitations of the system and characterize their normal and anomalous momentum distributions. We apply this framework to the interaction change of a 2D Bose gas and investigate the subsequent dynamics of its quantum structure factor and coherence function, both of which have recently been measured experimentally. Our results indicate that, in two dimensions, an independent quasiparticle description quickly becomes inaccurate and should be questioned when dealing with non-equilibrium scenarios.
Article
Mechanics
Pavel A. Andreev, I. N. Mosaki, Mariya Iv. Trukhanova
Summary: This study derives a finite temperature hydrodynamic model for spin-1 ultracold bosons, presenting a two fluid model of the Bose-Einstein condensate (BEC) and normal fluid, and deriving fluid dynamic equations for each. It examines the spectrum of bulk collective excitations for the ferromagnetic phase and the impact of spin waves in the described minimal coupling model.
Article
Multidisciplinary Sciences
Tomasz Swislocki, Mariusz Gajda, Miroslaw Brewczyk, Piotr Deuar
Summary: The study identifies two different mechanisms for spin distillation in Cr-52 and No-23 atoms, involving dipolar scattering and equilibrium relaxation of the thermal cloud. Through numerical simulations, it is demonstrated that the spin distillation cycle can be repeated multiple times, resulting in significant reduction of the thermal atom fraction. Threshold values of magnetic field and predictions for achievable temperature are also identified.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Yixin Guo, Hiroyuki Tajima, Tetsuo Hatsuda, Haozhao Liang
Summary: This paper theoretically examines the continuity between atomic and molecular Fermi superfluids in a Bose-Fermi mixture near the Feshbach resonance. A mean-field framework is constructed based on the perturbative expansion of the b-f-F Feshbach coupling in a two-channel model. The resulting effective Hamiltonian exhibits a continuity between atom-atom to molecule-molecule Cooper pairings and becomes equivalent to the two-band-superconductor model with a pair-exchange coupling.
Article
Physics, Multidisciplinary
Jin-Yi Zhang, Chang-Rui Yi, Long Zhang, Rui-Heng Jiao, Kai-Ye Shi, Huan Yuan, Wei Zhang, Xiong-Jun Liu, Shuai Chen, Jian-Wei Pan
Summary: Floquet engineering allows for the creation of new topological states that cannot be achieved in static systems. In this study, we experimentally realize and characterize anomalous topological states using high-precision Floquet engineering for ultracold atoms trapped in a shaking optical Raman lattice.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Hao-Tao Zhu, Yizhi Huang, Hui Liu, Pei Zeng, Mi Zou, Yunqi Dai, Shibiao Tang, Hao Li, Lixing You, Zhen Wang, Yu-Ao Chen, Xiongfeng Ma, Teng-Yun Chen, Jian-Wei Pan
Summary: In the past two decades, quantum key distribution networks based on telecom fibers have been implemented on metropolitan and intercity scales. One of the challenges is the exponential decay of the key rate with transmission distance. However, a recently proposed mode-pairing idea has allowed high-performance quantum key distribution without global phase locking, achieving improved key rates over conventional schemes in both metropolitan and intercity distances.
PHYSICAL REVIEW LETTERS
(2023)
Article
Pediatrics
Xinran Chu, Maoxiang Qian, Jin Yang, Dong Wu, Jing Gao, Lu Cao, Fang Fang, Jian Pan, Hui Zhang, Shaoyan Hu
Summary: The study aimed to evaluate the influence of GATA3 rs3824662 on pre-B-cell ALL susceptibility and long-term prognosis in Han Chinese children. The results showed that GATA3 rs3824662 was associated with susceptibility to pre-B-cell ALL and could be a risk factor for poor treatment response and treatment-related sepsis.
FRONTIERS IN PEDIATRICS
(2023)
Article
Nutrition & Dietetics
Mei Yan, Jian Pan, Jie Huang, Changwei Liu, Xiaona Xia, Ting Zhu, Yuanyuan Wan, Yongjun Fang, Weibing Tang
Summary: This study evaluated the nutritional status of children who underwent allogeneic hematopoietic stem cell transplantation (alloHSCT) in the first 100 days. The study aimed to clarify the effect of weight loss on clinical outcomes and to analyze factors influencing weight loss. Data from 80 pediatric patients were collected and analyzed to investigate the factors affecting weight loss and the impact of weight loss on clinical outcomes.
FRONTIERS IN NUTRITION
(2023)
Article
Optics
Wei Li, Likang Zhang, Hao Tan, Yichen Lu, Sheng-Kai Liao, Jia Huang, Hao Li, Zhen Wang, Hao-Kun Mao, Bingze Yan, Qiong Li, Yang Liu, Qiang Zhang, Cheng-Zhi Peng, Lixing You, Feihu Xu, Jian-Wei Pan
Summary: This article reports a QKD system that can generate keys at a record high rate of 115.8 Mb/s over a 10 km standard optical fiber and distribute keys over up to 328 km of ultralow-loss fiber. These abilities are attributed to a multipixel superconducting nanowire single-photon detector with an ultrahigh counting rate, an integrated transmitter that can stably encode polarization states with low error, a fast post-processing algorithm for generating keys in real time, and the high system clock rate operation. The results demonstrate the feasibility of practical high-rate QKD with photonic techniques, thus opening its possibility for widespread applications.
Article
Physics, Multidisciplinary
Yanting Cheng, Chengshu Li, Hui Zhai
Summary: Recently, the Rydberg blockade effect has been used to realize quantum spin liquid (QSL) on a kagome lattice, and evidence of QSL has been obtained experimentally by measuring non-local string order. In this paper, a Bardeen-Cooper-Schrieffer (BCS)-type variational wave function study is reported for the spin liquid state in this model, which is motivated by mapping the Rydberg blockade model to a lattice gauge theory. The predictions of this wave function are compared with experimental measurements of non-local string order, and good agreement is found.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Li-Zheng Liu, Yue-Yang Fei, Yingqiu Mao, Yi Hu, Rui Zhang, Xu-Fei Yin, Xiao Jiang, Li Li, Nai-Le Liu, Feihu Xu, Yu-Ao Chen, Jian-Wei Pan
Summary: In this study, a full-period quantum phase estimation approach is proposed and demonstrated. The approach adopts Kitaev's phase estimation algorithm to eliminate phase ambiguity and uses GHZ states to obtain phase values. Through an eight-photon experiment, the estimation of unknown phases in a full period is achieved, and the phase super-resolution and sensitivity beyond the shot-noise limit are observed. This research provides a new way for quantum sensing and represents a solid step towards its general applications.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Chong Ying, Bin Cheng, Youwei Zhao, He-Liang Huang, Yu-Ning Zhang, Ming Gong, Yulin Wu, Shiyu Wang, Futian Liang, Jin Lin, Yu Xu, Hui Deng, Hao Rong, Cheng-Zhi Peng, Man -Hong Yung, Xiaobo Zhu, Jian-Wei Pan
Summary: Although NISQ quantum computing devices are still limited in terms of qubit quantity and quality, quantum computational advantage has been experimentally demonstrated. Hybrid quantum and classical computing architectures have become the main paradigm for exhibiting NISQ applications, with the use of low-depth quantum circuits. This study demonstrates a circuit-cutting method for simulating quantum circuits with multiple logical qubits using only a few physical superconducting qubits, showcasing higher fidelity and scalability.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Yu-Hao Deng, Si-Qiu Gong, Yi-Chao Gu, Zhi-Jiong Zhang, Hua-Liang Liu, Hao Su, Hao-Yang Tang, Jia-Min Xu, Meng-Hao Jia, Ming-Cheng Chen, Han-Sen Zhong, Hui Wang, Jiarong Yan, Yi Hu, Jia Huang, Wei -Jun Zhang, Hao Li, Xiao Jiang, Lixing You, Zhen Wang, Li Li, Nai-Le Liu, Chao -Yang Lu, Jian-Wei Pan
Summary: Gaussian boson sampling (GBS) is a protocol for demonstrating quantum computational advantage and is mathematically associated with graph-related and quantum chemistry problems. This study investigates the enhancement of GBS over classical stochastic algorithms on noisy quantum devices in the computationally interesting regime. Experimental results show the presence of GBS enhancement with a large photon-click number and robustness under certain noise, which may stimulate the development of more efficient classical and quantum-inspired algorithms.
PHYSICAL REVIEW LETTERS
(2023)
Article
Instruments & Instrumentation
Chao Yu, Tianyi Li, Xian-Song Zhao, Hai Lu, Rong Zhang, Feihu Xu, Jun Zhang, Jian-Wei Pan
Summary: In this study, a 4H-SiC single-photon avalanche diode (SPAD) based free-running ultraviolet single-photon detector (UVSPD) with ultralow afterpulse probability is reported. A beveled mesa structure is designed and fabricated for the 4H-SiC SPAD, which shows the characteristic of ultralow dark current. A readout circuit of passive quenching and active reset with a tunable hold-off time setting is further developed to significantly suppress the afterpulsing effect. The nonuniformity of photon detection efficiency (PDE) across the SPAD active area is investigated for performance optimization. The compact UVSPD shows a PDE of 10.3%, a dark count rate of 133 kcps, and an afterpulse probability of 0.3% at 266 nm, indicating its potential for practical ultraviolet photon-counting applications.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Quantum Science & Technology
Xina Wang, Xufeng Jiao, Bin Wang, Yang Liu, Xiu-Ping Xie, Ming-Yang Zheng, Qiang Zhang, Jian-Wei Pan
Summary: This study demonstrates a low-noise quantum frequency conversion (QFC) process on the LNOI nanophotonic platform, achieving an internal conversion efficiency of 73% and an on-chip noise count of 900 counts per second (cps). The preservation of quantum statistical properties is also verified, indicating the potential applications of LNOI integrated circuits in quantum information. Additionally, an upconversion single-photon detector with a detection efficiency of 8.7% and a noise of 300 cps is constructed, paving the way for on-chip integrated single-photon detection.
NPJ QUANTUM INFORMATION
(2023)
Article
Instruments & Instrumentation
Jie Li, Zhi-Peng Jia, Peng Liu, Xiao-Yong Liu, De-Zhong Wang, De-Quan Kong, Su-Peng Li, Xing-Yang Cui, Han-Ning Dai, Yu-Ao Chen, Jian-Wei Pan
Summary: This study presents the design and construction of an integrated cold atomic beam source for strontium (Sr). The source utilizes a compact Zeeman slower and an atomic deflector to slow down the thermal atomic beam and select the cold flux. The system is compact, highly tunable, lightweight, and requires low electrical power, making it suitable for constructing optical atomic clocks and quantum simulation devices based on Sr.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Multidisciplinary
Chang Liu, Haifeng Tang, Hui Zhai
Summary: In this paper, the authors generalize Krylov complexity from a closed system to an open system coupled to a Markovian bath, where Lindbladian evolution replaces Hamiltonian evolution. They show that the Krylov complexity in open systems can be mapped to a non-Hermitian tight-binding model in a half-infinite chain. The strength of the non-Hermitian terms increases linearly with the increase of the Krylov basis index n.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Guo-Xian Su, Hui Sun, Ana Hudomal, Jean-Yves Desaules, Zhao-Yu Zhou, Bing Yang, Jad C. Halimeh, Zhen-Sheng Yuan, Zlatko Papie, Jian-Wei Pan
Summary: The ongoing quest for understanding nonequilibrium dynamics of complex quantum systems has led to the discovery of quantum many-body scarring. This phenomenon allows for the delay of thermalization by preparing the system in special initial states. In this study, the researchers demonstrate many-body scarring in a Bose-Hubbard quantum simulator, using previously unknown initial conditions. This work opens up new possibilities for exploring the relationship between scarring and various quantum phenomena.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Optics
Jin Cao, Huan Yang, Zhen Su, Xin-Yao Wang, Jun Rui, Bo Zhao, Jian-Wei Pan
Summary: We have successfully prepared a quantum degenerate mixture of 23Na 40K molecules and 40K atoms. The atoms are highly degenerate with a large number ratio, while the molecules are in a moderately degenerate state. The elastic collisions between the atoms and molecules provide a thermalization mechanism, allowing the molecules to reach thermal equilibrium before significant losses occur. The degeneracy of the molecules is maintained for a sufficient time interval for further study and production of ultracold triatomic molecular gases.
