Review
Physics, Multidisciplinary
Shengjie Jin, Xuzong Chen, Xiaoji Zhou
Summary: This article reviews the methods for manipulating high orbital ultracold atoms in optical lattices and discusses the construction of atom-orbital qubits and the study of the dynamical evolution of high orbital atoms. These studies are of great significance for the application of ultracold atoms in optical lattices in various fields.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Multidisciplinary
E. Trimby, H. Hirzler, H. Fuerst, A. Safavi-Naini, R. Gerritsma, R. S. Lous
Summary: This study presents numerical simulations on trapped ion buffer gas cooling using an ultracold atomic gas, exploring various trap parameters and driving schemes. The results show that ion energies are similar across different traps, even with experimental imperfections. Quantum mechanics cannot prevent micromotion-induced heating in atom-ion collisions. Buffer gas cooling is a viable alternative for cold controlled quantum chemistry and charged impurity physics, competing with sub-Doppler cooling techniques.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Saeed Ghanbari
Summary: We introduce 3D permanent magnetic lattices for ultracold atoms and provide analytical expressions for the location of magnetic field minima and various physical quantities. The trap depths, modulation depths, and trap frequencies can be controlled by the bias field. Compared to optical lattices, the permanent magnetic lattices offer higher trap depths and trap frequencies, particularly between magnetic layers.
Review
Quantum Science & Technology
Shangguo Zhu, Yun Long, Wei Gou, Mingbo Pu, Xiangang Luo
Summary: Arrays of individual atoms trapped in optical microtraps offer a versatile platform for quantum sciences and technologies. By utilizing tunnel-coupled optical microtraps, researchers can explore exotic quantum states, phases, and dynamics that are challenging to achieve in conventional optical lattices.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Multidisciplinary
Zhi-Cong Xu, Ziyu Zhou, Enhong Cheng, Li-Jun Lang, Shi-Liang Zhu
Summary: This study investigates the gain/loss effects on spin-orbit coupled ultracold atoms in two-dimensional optical lattices, revealing the interplay of non-Hermiticity and spin-orbit coupling. The researchers analytically obtain the topological phase diagram and develop a gauge-independent Wilson-loop method for numerically calculating the Chern number of multiple degenerate complex bands.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Multidisciplinary Sciences
S. Alyatkin, H. Sigurdsson, A. Askitopoulos, J. D. Topfer, P. G. Lagoudakis
Summary: This study explores the optical manipulation of exciton-polariton systems in Lieb lattices, revealing a nonequilibrium phase transition between scatterer lattice and trapped polariton condensates. By fine tuning lattice parameters, the researchers demonstrate the behavior of polaritons condensing in different potential regimes, paving the way for further exploration of non-Hermitian fluids in non-stationary mixtures.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Vaibhav Sharma, Erich J. Mueller
Summary: The study introduces a set of driven-dissipative protocols for controlling cold atoms in tilted optical lattices and showcases how dissipation can manipulate quantum many-body systems. By employing a specific experimental setup, the research team successfully achieved controllable atom transport in the lattice and generation of self-healing quantum states.
Article
Multidisciplinary Sciences
Tobias Kroker, Mario Grossmann, Klaus Sengstock, Markus Drescher, Philipp Wessels-Staarmann, Juliette Simonet
Summary: This study reports the creation of ultracold plasma by photoionization of a Bose-Einstein condensate with a femtosecond laser pulse, allowing direct access to electron temperature and revealing ultrafast cooling of electrons in an initially strongly coupled plasma.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
R. A. Carollo, D. C. Aveline, B. Rhyno, S. Vishveshwara, C. Lannert, J. D. Murphree, E. R. Elliott, J. R. Williams, R. J. Thompson, N. Lundblad
Summary: Significant progress has been made in understanding quantum systems through the exploration of geometry, topology, dimensionality, and interactions. This study reports observations of ultracold atom bubbles using the NASA Cold Atom Lab onboard the International Space Station. The observations explore the thermodynamics of the bubbles and demonstrate substantial cooling associated with their inflation. This work is among the first measurements made with ultracold atoms in space and holds promise for future research in orbital microgravity.
Article
Optics
Rocio Gomez-Rosas, Carlos A. Gonzalez-Gutierrez, Juan Mauricio Torres
Summary: An analytical approximate solution was derived for a generalized two-atom Tavis-Cummings model with nonlinear intensity-dependent matter-field interaction, allowing for the study of entanglement in the system and implementation of entangling atomic operations through field measurement. The model also demonstrated the possibility of generating authentic tripartite entangled states using a unitary three-qubit gate.
Article
Physics, Applied
Ryoto Takeuchi, Hayaki Chiba, Shoichi Okaba, Masao Takamoto, Shigenori Tsuji, Hidetoshi Katori
Summary: We have demonstrated the continuous outcoupling of ultracold Sr-88 atoms using a moving optical lattice. By optically pumping the atoms to the 5s5p P-3(0) state, we outcouple the atoms by a moving optical lattice. Such a continuous atomic source enables superradiant lasers and the zero-dead-time operation of atom interferometers and optical lattice clocks.
APPLIED PHYSICS EXPRESS
(2023)
Article
Physics, Multidisciplinary
A. Ciamei, S. Finelli, A. Trenkwalder, M. Inguscio, A. Simoni, M. Zaccanti
Summary: This study investigates ultracold collisions in a novel mixture of Li-6 and Cr-53 fermionic atoms and discovers more than 50 interspecies Feshbach resonances via loss spectroscopy. By constructing a full coupled-channel model, the scattering properties of Li-6-Cr-53 are unambiguously characterized and predictions are made for other isotopic pairs. The identified Feshbach resonances allow for controlled tuning of elastic s- and p-wave Li-6-Cr-53 interactions. This research highlights the suitability of lithium-chromium mixtures for the experimental exploration of highly correlated fermionic matter and the realization of ultracold polar molecules with dual electric and magnetic dipole moments.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Hao Qiao, Chang-Yue Sun, Cheng-Quan Peng, Qi-Chao Qi, Cheng-Cheng Zhao, Min Zhou, Xin-Ye Xu
Summary: In this experiment, the absolute frequencies and hyperfine splittings of ultracold 171Yb atoms in an optical lattice were determined. The frequencies were measured using a frequency comb referenced to an ultrastable optical cavity. The results showed higher linewidths than the natural linewidth due to probe and lattice light broadening. The measurements obtained were more accurate than previous measurements by one order of magnitude and also included the first measurements for certain transitions.
RESULTS IN PHYSICS
(2023)
Article
Optics
Donghao Li, Guoqi Bian, Jie Miao, Pengjun Wang, Zengming Meng, Liangchao Chen, Lianghui Huang, Jing Zhang
Summary: The study reports the measurement of the Rydberg excitation spectrum in ultra-cold (40K) Fermi gases through a two-photon process. Two methods were employed, one to reduce atomic losses using electromagnetically induced transparency, and the other to enhance losses through spontaneous avalanche ionization due to strong Rydberg-Rydberg interactions. The highest detectable Rydberg states were limited to n <= 62 due to competition between the long Rydberg blockade effective range and limited atomic cloud size.
Article
Multidisciplinary Sciences
Marcell Gall, Nicola Wurz, Jens Samland, Chun Fai Chan, Michael Koehl
Summary: Researchers have used high-resolution microscopy to explore quantum phases in two-dimensional fermionic systems in optical lattices. By implementing a bilayer Fermi-Hubbard model, they found that interlayer coupling controls the crossover between different electronic states, potentially advancing future studies on superconducting properties of Hubbard models.
Article
Physics, Applied
Qian Xie, Song-Tao Yu, Xuan-Kai Wang, Yong-Guang Zheng, Zhen-Sheng Yuan
Summary: In this study, a pure-phase superpixel (PPSP) method using a digital micromirror device (DMD) is implemented. The DMD operates in an unconventional mode as a phase-only modulator with multiple phase levels. An iterative Fourier transform algorithm is applied to the DMD in a 2f-configuration without filters, achieving high-quality adaptation. Simulation results demonstrate that when using 1600 x 1600 DMD pixels, the PPSP method combined with the mixed-region amplitude freedom algorithm reduces the root-mean-square error by at least 33.5% compared to conventional amplitude and phase modulation methods, while providing a 7.3% improvement in efficiency.
APPLIED PHYSICS EXPRESS
(2023)
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
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
Wei Li, Likang Zhang, Yichen Lu, Zheng-Ping Li, Cong Jiang, Yang Liu, Jia Huang, Hao Li, Zhen Wang, Xiang-Bin Wang, Qiang Zhang, Lixing You, Feihu Xu, Jian-Wei Pan
Summary: We propose and demonstrate a new method to achieve twin-field quantum key distribution (TF-QKD) without the need for phase locking. By separating the communication time into reference frames and quantum frames, we establish a global phase reference using the reference frames and reconcile the phase reference efficiently using a tailored algorithm based on fast Fourier transform. We successfully demonstrate no-phase-locking TF-QKD from short to long distances over standard optical fibers, achieving high secret key rates and repeaterlike key rates. Our work provides a scalable and practical solution to TF-QKD, representing an important step towards its wide applications.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Jian Qin, Yu-Hao Deng, Han-Sen Zhong, Li-Chao Peng, Hao Su, Yi-Han Luo, Jia-Min Xu, Dian Wu, Si-Qiu Gong, Hua-Liang Liu, Hui Wang, Ming-Cheng Chen, Li Li, Nai-Le Liu, Chao-Yang Lu, Jian-Wei Pan
Summary: Quantum metrology aims to enhance measurement sensitivity by utilizing quantum resources. We propose and realize a novel quantum metrology scheme that combines unconventional nonlinear interferometers and stimulated emission of squeezed light. Our method achieves a scalable, unconditional, and robust quantum metrological advantage, outperforming ideal 5-N00N states. The demonstrated enhancement in Fisher information per photon, without discounting for imperfections or photon loss, makes our approach applicable in practical quantum metrology at low photon flux regime.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Xue-Mei Gu, Liang Huang, Alejandro Pozas-Kerstjens, Yang-Fan Jiang, Dian Wu, Bing Bai, Qi-Chao Sun, Ming-Cheng Chen, Jun Zhang, Sixia Yu, Qiang Zhang, Chao-Yang Lu, Jian-Wei Pan
Summary: Nonlocality in networks composed of independent sources exhibits different phenomena compared to standard Bell scenarios. Network nonlocality in the entanglement-swapping scenario has been extensively studied, but previous violations of bilocality inequality could not certify the nonclassicality of their sources. We experimentally observe full network nonlocal correlations in a network where the loopholes of source-independence, locality, and measurement-independence are closed. Our experiment violates known inequalities for nonfull network nonlocal correlations by over 5 standard deviations, confirming the absence of classical sources.
PHYSICAL REVIEW LETTERS
(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
Physics, Multidisciplinary
Ming Li, Junfeng Wang, Youjin Deng
Summary: Explosive percolation in the Achlioptas process exhibits a variety of anomalous critical phenomena, which are different from continuous phase transitions. In an event-based ensemble, we find that the critical behaviors in explosive percolation are clean and follow standard finite-size scaling theory, except for fluctuations in pseudo-critical points. Multiple fractal structures emerge in the fluctuation window and their values can be derived from a crossover scaling theory. The mixing effects of these structures explain the previously observed anomalous phenomena. The clean scaling in the event-based ensemble allows us to determine the critical points and exponents for various bond-insertion rules with high precision, resolving ambiguities about their universality. The findings hold true for any spatial dimensions.
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
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.
