Article
Multidisciplinary Sciences
F. Hassani, M. Peruzzo, L. N. Kapoor, A. Trioni, M. Zemlicka, J. M. Fink
Summary: Currently available quantum processors are limited by noise, but the introduction of the inductively shunted transmon offers a solution by providing protection against flux noise and a longer coherence time. The device also reveals quantum tunneling between prepared fluxon states with a long average decay time of up to 3.5 hours.
NATURE COMMUNICATIONS
(2023)
Article
Quantum Science & Technology
Sven Jandura, Jeff D. Thompson, Guido Pupillo
Summary: Researchers introduced a new gate sequence that is robust against intensity inhomogeneity and Doppler shifts, reducing the sensitivity of gate operations in neutral-atom qubits to experimental imperfections. The gates outperform existing ones for moderate or large imperfections, and show improved performance even for very small imperfections when applied to erasure-biased qubits based on metastable 171Yb.
Article
Physics, Multidisciplinary
Julien Vaneecloo, Sebastien Garcia, Alexei Ourjoumtsev
Summary: We demonstrate a new versatile building block for optical quantum technologies, combining cavity quantum electrodynamics and interacting atomic ensembles to achieve deterministic quantum engineering of light.
Article
Optics
D. M. Walker, L. L. Brown, S. D. Hogan
Summary: The electric-field distribution in a single mode of a lambda/4 superconducting coplanar waveguide (CPW) microwave resonator has been probed using beams of helium Rydberg atoms. The coherence times of the atom-resonator-field interaction and the atomic superposition states were determined, and residual uncanceled dc electric fields were measured.
Article
Optics
Yu-Ting Chen, Micheal Szurek, Bei Hu, Julius DE Hond, Boris Braverman, Vladen Vuletic
Summary: We report a high-finesse bow-tie cavity designed for atomic physics experiments with Rydberg atom arrays. The cavity has a high finesse and small waist, enabling strong coupling effects. The cavity setup utilizes lenses to trap and image atoms, providing good optical access and minimizing stray electric fields. This cavity setup can be used in conjunction with a Rydberg array platform for quantum simulation and computation.
Article
Physics, Multidisciplinary
Seokho Jeong, Xiao-Feng Shi, Minhyuk Kim, Jaewook Ahn
Summary: Rydberg atom arrays are useful for various quantum applications. In this study, researchers propose an all-optical gate-based quantum computing scheme using auxiliary atoms for remote couplings and optical addressing for constructing universal quantum gates. They also provide a detailed resource estimate for implementing this scheme in a Rydberg quantum simulator.
FRONTIERS IN PHYSICS
(2022)
Article
Optics
L. V. Gerasimov, R. R. Yusupov, A. D. Moiseevsky, I. Vybornyi, K. S. Tikhonov, S. P. Kulik, S. S. Straupe, C. I. Sukenik, D. V. Kupriyanov
Summary: This article presents a detailed theoretical analysis of the physics underlying the implementation of a Rydberg two-qubit gate using single atoms. The authors focus on a blockade-type entangling gate and consider various decoherence processes that may limit its performance in a real system. Numerical estimates for fidelity limits and predictions for the full process matrix are provided. The study's methods and results are applicable to the simulation and optimization of neutral atom-based quantum processors.
Article
Multidisciplinary Sciences
D. Bluvstein, A. Omran, H. Levine, A. Keesling, G. Semeghini, S. Ebadi, T. T. Wang, A. A. Michailidis, N. Maskara, W. W. Ho, S. Choi, M. Serbyn, M. Greiner, V. Vuletic, M. D. Lukin
Summary: The study demonstrates that coherent revivals associated with quantum many-body scars can be stabilized by periodic driving, generating a robust subharmonic response akin to discrete timecrystalline order. This finding provides new ways to control complex dynamics in many-body systems and may have potential applications in quantum information science.
Article
Quantum Science & Technology
Jordi R. Weggemans, Alexander Urech, Alexander Rausch, Robert Spreeuw, Richard Boucherie, Florian Schreck, Kareljan Schoutens, Jiri Minar, Florian Speelman
Summary: In this study, we apply the quantum approximate optimization algorithm (QAOA) and qudits to solve the correlation clustering problem. We propose a full stack approach for correlation clustering using a neutral atom quantum computer, including the Hamiltonian formulation of the algorithm, performance analysis, and identification of suitable level structure. Our results show that the qudit implementation outperforms the qubit encoding. Numerical studies evaluate the algorithm's performance on complete and ErdOs-Renyi graphs, and indicate that QAOA consistently surpasses the Swamy bound for approximation ratio.
Article
Physics, Multidisciplinary
Xiao-Feng Shi
Summary: This paper presents two solutions to the challenge of Rydberg excitation in alkaline-earth-like atoms with complicated nuclear spin states. The first theory involves exciting two nuclear spin qubit states to Rydberg states with detuning from a weak magnetic field, while the second theory demonstrates a two-photon Rydberg excitation with only one nuclear spin qubit state. These theories offer a versatile approach to quantum computation leveraging Rydberg blockade and nuclear-spin quantum memory advantages.
FRONTIERS OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Liping Hao, Zhengyang Bai, Jingxu Bai, Suying Bai, Yuechun Jiao, Guoxiang Huang, Jianming Zhao, Weibin Li, Suotang Jia
Summary: An ensemble of excited atoms can synchronize emission of light collectively in a process known as superradiance, which is strongly influenced by the surrounding electromagnetic fields. Enhanced by microwave photons from blackbody radiation, superradiance of Rydberg atoms is observed and studied, providing insights into collective photon-atom interactions and potential applications in blackbody thermometry.
NEW JOURNAL OF PHYSICS
(2021)
Review
Quantum Science & Technology
Xiao-Feng Shi
Summary: This article discusses the significance of quantum gates and entanglement based on dipole-dipole interactions of neutral Rydberg atoms in both fundamental physics and quantum information science. It highlights the precision and robustness of Rydberg-mediated entanglement protocols, which are key factors limiting their applicability in experiments and near-future industry. The article reviews various methods for generating entangling gates by exploring the Rydberg interactions of neutral atoms, and emphasizes the achievable fidelity and robustness to technical issues and detrimental innate factors.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Review
Physics, Multidisciplinary
Jinpeng Yuan, Wenguang Yang, Mingyong Jing, Hao Zhang, Yuechun Jiao, Weibin Li, Linjie Zhang, Liantuan Xiao, Suotang Jia
Summary: This paper reviews the quantum sensing of microwave electric fields using Rydberg atoms. Rydberg atoms, with their exaggerated response and diverse energy levels, have been widely used for ultrasensitive, wide broadband, traceable, and stealthy microwave electric field sensing. The paper provides an overview of the development in this research direction and introduces new methods and systems to enhance the performance of microwave electric field sensing.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Quantum Science & Technology
Minh-Thi Nguyen, Jin-Guo Liu, Jonathan Wurtz, Mikhail D. Lukin, Sheng-Tao Wang, Hannes Pichler
Summary: Programmable quantum systems based on Rydberg atom arrays have been used for efficient tests of quantum optimization algorithms and can handle hundreds of qubits. These systems efficiently encode the maximum independent set problem on unit-disk graphs. By constructing explicit mappings, we extend the range of problems that can be efficiently encoded in Rydberg arrays, with at most a quadratic overhead in qubit number. Our work provides a blueprint for using Rydberg atom arrays to solve a wide range of combinatorial optimization problems with arbitrary connectivity.
Article
Physics, Multidisciplinary
Wei Li, Renming Liu, Junyu Li, Jie Zhong, Yu-Wei Lu, Huanjun Chen, Xue-Hua Wang
Summary: A highly efficient approach for achieving strong coupling between single excitons and localized plasmon modes at room temperature is presented. By reducing the critical interaction strength at the exceptional point, rather than enhancing the coupling strength, the researchers were able to overcome the system's large damping. Experimental results showed a significant improvement in the success rate of achieving strong coupling, from about 1% to about 80%.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
T. M. Graham, M. Kwon, B. Grinkemeyer, Z. Marra, X. Jiang, M. T. Lichtman, Y. Sun, M. Ebert, M. Saffman
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Applied
Yuan Sun, Peng Xu, Ping-Xing Chen, Liang Liu
PHYSICAL REVIEW APPLIED
(2020)
Article
Physics, Applied
Xin Wang, Yuan Sun, Hua-Dong Cheng, Jin-Yin Wan, Yan-Ling Meng, Ling Xiao, Liang Liu
PHYSICAL REVIEW APPLIED
(2020)
Article
Physics, Applied
Yangyang Liu, Yuan Sun, Zhuo Fu, Peng Xu, Xin Wang, Xiaodong He, Jin Wang, Mingsheng Zhan
Summary: This study investigates the coherence of ground-Rydberg transitions in a single atom subjected to various pulse sequences, particularly focusing on the CZ gate sequence. It is found that the process experienced by the control qubit atom under a two-qubit entangling process with the H-CZ controlled-NOT gate scheme is essentially similar to ground-Rydberg Ramsey interference. A theoretical model linking the decoherence time of the control qubit to the CZ pulse sequence is established, shedding light on the origins of decoherence effects and potential ways to improve fidelity of the CZ gate.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Xin Wang, Yuan Sun, Liang Liu
Summary: Cold atom quantum sensing utilizing isotropic laser cooling is a promising area of research that offers advantages such as compactness and robustness. The study presents a specially tailored isotropic laser cooling system designed for quantum sensing applications, demonstrating improved detection processes and quantitatively deduced laser strength. Characterization of the system's properties and performance enhancements for future developments in quantum sensing and precision measurements are highlighted.
Article
Optics
Xin Wang, Yuan Sun, Liang Liu
Summary: Optical detection and manipulation of thermal properties in cold atoms is a crucial research topic. In this experiment, we achieved fast temperature measurement and separation of colder atoms using nearly nondestructive detection. These accomplishments rely on a labeling process and continuous optical pulses, while addressing the issue of detection noise.
PHOTONICS RESEARCH
(2022)
Article
Multidisciplinary Sciences
De-Sheng Lu, Wei Ren, Yuan Sun, Tang Li, Qiu-Zhi Qu, Bin Wang, Lin Li, Jian-Bo Zhao, Xin Zhao, Jing-Wei Ji, Mei-Feng Ye, Jing-Feng Xiang, Wei-Biao Chen, Yu-Zhu Wang, Liang Liu
Summary: Observation of highly efficient laser cooling in microgravity through conducting cold atom experiment in a space lab with successful and consistent performance for almost three years since 2016.
NATIONAL SCIENCE REVIEW
(2023)
Article
Optics
Yuan Sun
Summary: Recently, the idea of a two-qubit controlled phase gate using off-resonant modulated driving has been introduced to the neutral atom qubit platform. This concept applies to both single-photon and two-photon ground-Rydberg transitions. In order to improve practical performance, further development is required to overcome existing limitations. This study thoroughly analyzes different modulation styles for two-photon transitions and demonstrates the versatility of off-resonant modulated driving protocols.
Article
Optics
Zhuo Fu, Peng Xu, Yuan Sun, Yang-Yang Liu, Xiao-Dong He, Xiao Li, Min Liu, Run-Bing Li, Jin Wang, Liang Liu, Ming-Sheng Zhan
Summary: This article reports experimental results on the realization of a two-qubit controlled-PHASE (CZ) gate via single-modulated-pulse off-resonant modulated driving in rubidium (Rb) atoms. The gate operation is completed using a carefully calculated smooth waveform global driving laser pulse and combined with global microwave pulses to generate two-atom entanglement.
