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arXiv 2023年

作者： Xu, Liang Zhou, Mingti Tao, Runxia Zhong, Zhipeng Wang, Ben Cao, Zhiyong Xia, Hongkuan Wang, Qianyi Zhan, Hao Zhang, Aonan Yu, Shang Xu, Nanyang Dong, Ying Ren, Changliang Zhang, Lijian College of Metrology and Measurement Engineering China Jiliang University Hangzhou310018 China National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and Manipulation College of Engineering and Applied Sciences Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Research Center for Quantum Sensing Zhejiang Lab Hangzhou310000 China School of Electronic Control Chang’an University Xi’an710064 China Quantum Optics and Laser Science Blackett Laboratory Imperial College London Prince Consort Rd LondonSW7 2AZ United Kingdom Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China

Sequential weak measurements allow for the direct extraction of individual density-matrix elements, rather than relying on global reconstruction of the entire density matrix, which opens a new avenue for the characterization of quantum systems. Nevertheless, extending the sequential scheme to multi-qudit quantum systems is challenging due to the requirement of multiple coupling processes for each qudit and the lack of appropriate precision evaluation. To address these issues, we propose a resource-efficient scheme (RES) that directly characterizes the density matrix of general multi-qudit systems while optimizing measurements and establishing a feasible estimation analysis. In the RES, an efficient observable of the quantum system is constructed such that a single meter state coupled to each qudit is sufficient to extract the corresponding density-matrix element. An appropriate model based on the statistical distribution of errors is utilized to evaluate the precision and feasibility of the scheme. We have experimentally applied the RES to the direct characterization of general single-photon qutrit states and two-photon entangled states. The results show that the RES outperforms sequential schemes in terms of efficiency and precision in both weak- and strong-coupling scenarios. This work sheds new light on the practical characterization of large-scale quantum systems and the investigation of their non-classical properties. © 2023, CC BY.

关键词： Photons

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Quantum versus Classical Regime in Circuit Quantum Acoustodynamics

arXiv

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arXiv 2020年

作者： Zeng, Gang-Hui Zhang, Yang Bolgar, Aleksey N. He, Dong Li, Bin Ruan, Xin-Hui Zhou, Lan Kuang, Le-Mang Astafiev, Oleg V. Liu, Yu-Xi Peng, Z.H. Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Institute of Microelectronics Tsinghua University Beijing100084 China Moscow Institute of Physics and Technology Institutskiy Pereulok 9 Dolgoprudny141701 Russia Institute for Quantum Information State Key Laboratory of High Performance Computing Changsha410081 China Skolkovo Institute of Science and Technology Nobel str. 3 Moscow143026 Russia Royal Holloway University of London Egham Surrey TW20 0EX United Kingdom National Physical Laboratory TeddingtonTW11 0LW United Kingdom Frontier Science Center for Quantum Information Beijing China

We experimentally study a circuit quantum acoustodynamics system, which consists of a superconducting artificial atom, coupled to both a two-dimensional surface acoustic wave resonator and a one-dimensional microwave transmission line. The strong coupling between the artificial atom and the acoustic wave resonator is confirmed by the observation of the vacuum Rabi splitting at the base temperature of dilution refrigerator. We show that the propagation of microwave photons in the microwave transmission line can be controlled by a few phonons in the acoustic wave resonator. Furthermore, we demonstrate the temperature effect on the measurements of the Rabi splitting and temperature induced transitions from high excited dressed states. We find that the spectrum structure of two-peak for the Rabi splitting could become into those of several peaks under some special experimental conditions, and gradually disappears with the increase of the environmental temperature T. The continuous quantum-to-classical crossover is observed around the crossover temperature Tc, which is determined via the thermal fluctuation energy kBT and the characteristic energy level spacing of the coupled system. Experimental results agree well with the theoretical simulations via the master equation of the coupled system at different effective temperatures. Copyright © 2020, The Authors. All rights reserved.

关键词： Telecommunication lines

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Dynamics of polar skyrmion bubbles under electric fields

arXiv

引用

arXiv 2021年

作者： Zhu, Ruixue Jiang, Zhexin Zhang, Xinxin Zhong, Xiangli Tan, Congbing Liu, Mingwei Sun, Yuanwei Li, Xiaomei Qi, Ruishi Qu, Ke Liu, Zhetong Wu, Mei Li, Mingqiang Huang, Boyuan Xu, Zhi Wang, Jinbin Liu, Kaihui Gao, Peng Wang, Jie Li, Jiangyu Bai, Xuedong Electron Microscopy Laboratory and International Center for Quantum Materials School of Physics Peking University Beijing100871 China Department of Engineering Mechanics Zhejiang University Zhejiang Hangzhou310027 China School of Materials Science and Engineering Xiangtan University Hunan Xiangtan411105 China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and Electronics Hunan University of Science and Technology Hunan Xiangtan411201 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and Technology Guangdong Shenzhen518055 China Department of Materials Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University Zhejiang Hangzhou310027 China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of Physics Peking University Beijing100871 China Collaborative Innovation Centre of Quantum Matter Beijing100871 China

Room-temperature polar skyrmion bubbles that are recently found in oxide superlattice, have received enormous interests for their potential applications in nanoelectronics due to the nanometer size, emergent chirality, and negative capacitance. For practical applications, the ability to controllably manipulate them by using external stimuli is prerequisite. Here, we study the dynamics of individual polar skyrmion bubbles at the nanoscale by using in situ biasing in a scanning transmission electron microscope. The reversible electric field-driven phase transition between topological and trivial polar states are demonstrated. We create, erase and monitor the shrinkage and expansion of individual polar skyrmions. We find that their transition behaviors are substantially different from that of magnetic analogue. The underlying mechanism is discussed by combing with the phase-field simulations. The controllable manipulation of nanoscale polar skyrmions allows us to tune the dielectric permittivity at atomic scale and detailed knowledge of their phase transition behaviors provides fundamentals for their applications in nanoelectronics. © 2021, CC BY.

关键词： Electric fields

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Creating topological polar structure in a nonpolar matter

arXiv

引用

arXiv 2020年

作者： Abid, Adeel Y. Sun, Yuanwei Hou, Xu Zhong, Xiangli Tan, Congbing Zhu, Ruixue Chen, Haoyun Qu, Ke Li, Yuehui Wu, Mei Zhang, Jingmin Wang, Jinbin Liu, Kaihui Bai, Xuedong Yu, Dapeng Wang, Jie Li, Jiangyu Gao, Peng International Center for Quantum Materials Peking University Beijing100871 China School of Materials Science and Engineering Xiangtan University Hunan Xiangtan411105 China Department of Engineering Mechanics School of Aeronautics and Astronautics Zhejiang University Hangzhou310027 China Department of Physics and Electronic Science Hunan University of Science and Technology Hunan Xiangtan411201 China Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences ShenzhenGuangdong518055 China Electron Microscopy Laboratory School of Physics Peking University Beijing100871 China Collaborative Innovation Centre of Quantum Matter Beijing100871 China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University Hangzhou310027 China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of Physics Peking University Beijing100871 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen518055 China Department of Materials Science and Engineering Southern University of Science and Technology ShenzhenGuangdong518055 China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing100190 China

Nontrivial topological structures offer rich playground in condensed matter physics including fluid dynamics1,2, superconductivity3, and ferromagnetism4,5, and they promise alternative device configurations for post-Moore spintronics and electronics6,7. Indeed, magnetic skyrmions are actively pursued for high-density data storage8, while polar vortices with exotic negative capacitance9 may enable ultralow power consumption in microelectronics. Following extensive investigations on a variety of magnetic textures including vortices5,10, domain walls11 and skyrmions12 in the past decades, studies on polar topologies have taken off in recent years, resulting in discoveries of closure domains13, vortices14, and skyrmions15 in ferroelectric materials. Nevertheless, the atomic-scale creation of topological polar structures is largely confined in a single ferroelectric system, PbTiO3 (PTO) with large polarization, casting doubt on the generality of polar topologies and limiting their potential applications. In this work, we successfully create previously unrealized atomic-scale polar antivortices in the nominally nonpolar SrTiO3 (STO)16, expanding the reaches of topological structures and completing an important missing link in polar topologies. The work shed considerable new insight into the formation of topological polar structures, and offers guidance in searching for new polar textures. Copyright © 2020, The Authors. All rights reserved.

关键词： Topology

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Controllable non-Hermitian qubit–qubit coupling in superconducting quantum circuit

APL Quantum

引用

APL Quantum 2024年第4期1卷

作者： Hui Wang Yan-Jun Zhao Xun-Wei Xu Inspur Artificial Intelligence Research Institute Jinan 250014 China Shandong Yunhai Guochuang Innovative Technology Co. Ltd. Jinan 250101 China Key Laboratory of Opto-electronic Technology Ministry of Education Beijing University of Technology Beijing 100124 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China

We propose a theoretical scheme to realize the controllable non-Hermitian qubit–qubit coupling by adding a high-loss resonator in a tunable coupling superconducting quantum circuit. By changing the effective qubit–qubit coupling, the phase and amplitude of resonator–qubit interaction, and the qubits’ quantum states, we can continually tune the energy level attraction, the position of EP (exceptional point), and the non-reciprocity in the non-Hermitian superconducting circuit. The EPs and non-reciprocity can affect the quantum states’ evolutions and exchange efficiencies for two qubits in the non-Hermitian superconducting circuit. The controllable non-Hermitian and non-reciprocal interactions between two qubits provide new insights and methods for exploring the unconventional quantum effects in superconducting quantum circuits.

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Dark photon constraints from a 7.139 GHz cavity haloscope experiment

arXiv

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arXiv 2024年

作者： He, Dong Fan, Jie Gao, Xin Gao, Yu Houston, Nick Ji, Zhongqing Jin, Yirong Li, Chuang Li, Jinmian Li, Tianjun Liu, Shi-Hang Niu, Jia-Shu Peng, Zhihui Sun, Liang Sun, Zheng Wang, Jia Wei, Puxian Wu, Lina Xiang, Zhongchen Yang, Qiaoli Zhang, Chi Zhang, Wenxing Zhang, Xin Zheng, Dongning Zheng, Ruifeng Zhou, Jian-Yong Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Institute of Physics Chinese Academy of Sciences Beijing100190 China College of Physics Sichuan University Chengdu610065 China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of Theoretical Physics Faculty of Science Beijing University of Technology Beijing100124 China Beijing Academy of Quantum Information Sciences Beijing100193 China College of Mechanical and Electrical Engineering Wuyi University Nanping354300 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences No. 19A Yuquan Road Beijing100049 China Institute of Theoretical Physics Shanxi University Taiyuan030006 China College of Physics and Optoelectronic Engineering Department of Physics Jinan University Guangzhou510632 China School of Sciences Xi’an Technological University Xi’an710021 China Tsung-Dao Lee Institute School of Physics and Astronomy Shanghai Jiao Tong University 800 Dongchuan Road Shanghai200240 China National Astronomical Observatories Chinese Academy of Sciences 20A Datun Road Chaoyang District Beijing100101 China School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing100049 China

The dark photon is a promising candidate for the dark matter which comprises most of the matter in our visible Universe. Via kinetic mixing with the Standard Model it can also be resonantly converted to photons in an electromagnetic cavity, offering novel experimental possibilities for the discovery and study of dark matter. We report the results of a pathfinder dark photon dark matter cavity search experiment performed at hunan Normal University and the Institute of Physics, Chinese Academy of Sciences, representing the first stage of the APEX (Axion and dark Photon EXperiment) program. Finding no statistically significant excess, we place an upper limit on the kinetic mixing parameter |χ| −13 around mA 29.5 µeV at 90% confidence level. This result exceeds other constraints on dark photon dark matter in this frequency range by roughly an order of magnitude. Copyright © 2024, The Authors. All rights reserved.

关键词： Photons

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Calibration of the Cryogenic Measurement System of a Resonant Haloscope Cavity

arXiv

引用

arXiv 2024年

Possible light bosonic dark matter interactions with the Standard Model photon have been searched by microwave resonant cavities. In this paper, we demonstrate the cryogenic readout system calibration of a 7.138 GHz copper cavity with a loaded quality factor Ql = 104, operated at 22 mK temperature based on a dilution refrigerator. Our readout system consists of High Electron Mobility Transistors as cryogenic amplifiers at 4 K, plus room-temperature amplifiers and a spectrum analyzer for signal power detection. We test the system with a superconducting two-level system as a single-photon source in the microwave frequency regime and report an overall 95.6 dB system gain and -71.4 dB attenuation in the cavity’s input channel. The effective noise temperature of the measurement system is 7.5 K. © 2024, CC BY.

关键词： Spectrum analyzers

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2D Transition Metal Dichalcogenide: Unraveling High-Yield Phase-Transition Dynamics in Transition Metal Dichalcogenides on Metallic Substrates (Adv. Sci. 7/2019)

引用

Advanced Science 2019年第7期6卷 1970042-1970042页

作者： Xinmao Yin Chi Sin Tang Di Wu Weilong Kong Changjian Li Qixing Wang Liang Cao Ming Yang Yung-Huang Chang Dianyu Qi Fangping Ouyang Stephen J. Pennycook Yuan Ping Feng Mark B. H. Breese Shi Jie Wang Wenjing Zhang Andrivo Rusydi Andrew T. S. Wee Department of Physics Faculty of Science National University of Singapore Singapore 117542 Singapore Singapore Synchrotron Light Source (SSLS) National University of Singapore Singapore 117603 Singapore NUS Graduate School for Integrative Sciences and Engineering National University of Singapore Singapore 117456 Singapore International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Shenzhen University Shenzhen 518060 China Hunan Key Laboratory of Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University No. 932 South Lushan Road Changsha Hunan Province 410083 China Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei 230031 China Institute of Materials Research and Engineering A∗STAR (Agency for Science Technology and Research) 2 Fusionopolis Way Singapore 138634 Singapore Bachelor Program in Interdisciplinary Studies National Yunlin University of Science and Technology Yunlin 640 Taiwan

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