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Autonomous Feedback Stabilization of a Cavity-Coupled Spin Oscillator

Physical Review Letters 2025年第5期134卷 053603-053603页

作者： Julian Wolf Olive H. Eilbott Joshua A. Isaacs Kevin P. Mours Jonathan Kohler Dan M. Stamper-Kurn Department of Physics University of California Berkeley California 94720 USA Challenge Institute for Quantum Computation University of California Berkeley California 94720 USA Present address: Vector Atomic Inc. Pleasanton California 94586 USA. Present address: Eikon Therapeutics Hayward California 94545 USA. Technische Universität Kaiserslautern 67663 Kaiserslautern Germany Present address: Max-Planck-Institut für Quantenoptik Garching Germany Munich Center for Quantum Science and Technology (MCQST) 80799 Munich Germany. Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA

We report out-of-equilibrium stabilization of the collective spin of an atomic ensemble through autonomous feedback by a driven optical cavity. For a magnetic field applied at an angle to the cavity axis, dispersive coupling to the cavity provides sensitivity to a combination of the longitudinal and transverse spin. Coherent backaction by cavity light onto the atoms, conditioned by the cavity susceptibility, stabilizes the spin state at an arbitrary energy. The setpoint tracking and closed-loop gain spectrum of the feedback system are characterized and found to agree closely with analytic predictions.

关键词： Spin dynamics

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Unconventional Geometric Phase-Shift Gates Based on Superconducting Quantum Interference Devices Coupled to a Single-Mode Cavity

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Communications in Theoretical physics 2006年第4X期46卷 631-634页

作者： SONG Ke-Hui ZHOU Zheng-Wei GUO Guang-Can Key Laboratory of Quantum Communication and Quantum Computation University of Science and Technology of China Hefei 230026 China Department of Electronic Information Science and Physics Huaihua University Huaihua 418008China

We present a scheme to realize geometric phase-shift gate for two superconducting quantum interference device （SQUID） qubits coupled to a single-mode microwave field. The geometric phase-shift gate operation is performed in two lower flux states, and the excited state [2〉 would not participate in the procedure. The SQUIDs undergo no transitions during the gate operation. Thus, the docoherence due to energy spontaneous emission based on the levels of SQUIDs are suppressed. The gate is insensitive to the cavity decay throughout the operation since the cavity mode is displaced along a circle in the phase space, acquiring a phase conditional upon the two lower flux states of the SQUID qubits, and the cavity mode is still in the original vacuum state. Based on the SQUID qubits interacting with the cavity mode, our proposed approach may open promising prospects for quantum iogic in SQUID-system.

关键词： geometric phase-shift gate superconducting quantum interference device cavity-QED

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Relative Entropy of Entanglement of One Class of Two-Qubit system

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Chinese physics Letters 2001年第3期18卷 325-327页

作者： LIANG Lin-Mei CHEN Ping-Xing LI Cheng-Zu HUANG Ming-Qiu Laboratory of Quantum Communication and Quantum Computation University of Science and Technology of ChinaHefei 230026 Department of Applied Physics National University of Defense TechnologyChangsha 410073 CCAST(World Laboratory)P.O.Box 8730 Beijing 100080

The relative entropy of entanglement of a mixed stateσfor a bipartite quantum system can be defined as the minimum of the quantum relative entropy over the set of completely disentangled *** et al.[***.A 57(1998)1619]have recently proposed a numerical method to get the relative entropy of entanglement Ere for two-qubit *** paper shows that the convex programming method can be applied to calculate Ere of two-qubit systems analytically,and discusses the conditions under which the method can be adopted.

关键词： entropy system quantum

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Probing dynamic interference in high-order harmonic generation from long-range molecular ion:Bohmian trajectory investigation

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Chinese physics B 2014年第5期23卷 233-237页

作者：王俊王兵兵郭福明李苏宇丁大军陈基根曾思良杨玉军 Institute of Atomic and Molecular Physics Jilin University Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Department of Physics and Materials Engineering Taizhou University Science and Technology Computation Physics Laboratory Institute of Applied Physics and Computational Mathematics Data Center for High Energy Density Physics Institute of Applied Physics and Computational Mathematics

Using Bohmlan trajectory （151） method, we investigate the dynamic interference in nlgn-orcter narmonlc generauon from diatomic molecular ions. It is demonstrated that the main characteristics of the molecular harmonic spectrum can be well reproduced by only two BTs which are located at the two ions. This haiapens because these two localized trajectories can receive and store the whole collision information coming from all of the other re-collision trajectories. Therefore, the amplitudes and frequencies of these two trajectories represent the intensity and frequency distribution of the harmonic generation. Moreover, the interference between these two trajectories shows a dip in the harmonic spectrum, which reveals the molecular structure information.

关键词： Bohmian trajectory molecular high-order harmonic generation dynamic interference

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Energy law preserving continuous finite element schemes for a gas metal arc welding system

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Communications in Theoretical physics 2021年第2期73卷 30-40页

作者： Yanhai Lin Yongyue Jiang Fujian Province University Key Laboratory of Computation Science and School of Mathematical Sciences Huaqiao UniversityQuanzhou 362021China School of Mathematics and Physics University of Science and Technology BeijingBeijing 00083China

In this paper a modifed continuous energy law was explored to investigate transport behavior in a gas metal arc welding(GMAW)*** energy law equality at a discrete level for the GMAW system was derived by using the finite element *** mass conservation and current density continuous equation with the penalty scheme was applied 10 improve the *** to the phase-field model coupled with the energy law preserving method,the GMAW model was discretized and a metal transfer process with a pulse current was *** was found that the numerical solution agrees well with the data of the metal transfer process obtained by high-speed *** with the numerical solution of the volume of fuid model,which was widely studied in the GMAW system based on the finite element method Euler scheme,the energy law preserving method can provide better accuracy in predicting the shape evolution of the droplet and with a greater computing efficiency.

关键词： phase field gas metal arc welding(GMAW) metal transfer discrete energy law finite element method numerical solution

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Charge transfer modification of inverted planar perovskite solar cells by NiO_(x)/Sr:NiO_(x)bilayer hole transport layer

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Chinese physics B 2022年第3期31卷 624-630页

作者： Qiaopeng Cui Liang Zhao Xuewen Sun Qiannan Yao Sheng Huang Lei Zhu Yulong Zhao Jian Song Yinghuai Qiang The Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments School of Materials Science and PhysicsChina University of Mining and TechnologyXuzhou 21116China Advanced Analysis&Computation Center China University of Mining and TechnologyXuzhou 21116China

Perovskite solar cells(PSCs) are the most promising commercial photoelectric conversion technology in the *** planar p–i–n structure cells have advantages in negligible hysteresis, low temperature preparation and excellent ***, for inverted planar PSCs, the non-radiative recombination at the interface is an important reason that impedes the charge transfer and improvement of power conversion efficiency. Having a homogeneous, compact, and energy-levelmatched charge transport layer is the key to reducing non-radiative recombination. In our study, NiO_(x)/Sr:NiO_(x)bilayer hole transport layer(HTL) improves the holes transmission of NiO_(x)based HTL, reduces the recombination in the interface between perovskite and HTL layer and improves the device performance. The bilayer HTL enhances the hole transfer by forming a driving force of an electric field and further improves J_(sc). As a result, the device has a power conversion efficiency of 18.44%, a short circuit current density of 22.81 m A·cm^(-2) and a fill factor of 0.80. Compared to the pristine PSCs, there are certain improvements of optical parameters. This method provides a new idea for the future design of novel hole transport layers and the development of high-performance solar cells.

关键词： perovskite solar cells nickel oxide Sr doping bilayer hole transport layer

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Layer Hall effect induced by hidden Berry curvature in antiferromagnetic insulators

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National science Review 2024年第2期11卷 15-23页

作者： Rui Chen Hai-Peng Sun Mingqiang Gu Chun-Bo Hua Qihang Liu Hai-Zhou Lu X.C.Xie Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology(SUSTech) International Quantum Academy Institute for Theoretical Physics and Astrophysics University of Würzburg School of Electronic and Information Engineering Hubei University of Science and Technology Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Shenzhen Key Laboratory of Quantum Science and Engineering International Center for Quantum Materials School of PhysicsPeking University Collaborative Innovation Center of Quantum Matter CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences

The layer Hall effect describes electrons spontaneously deflected to opposite sides at different layers, which has been experimentally reported in the MnBi2Te4thin films under perpendicular electric fields. Here, we reveal a universal origin of the layer Hall effect in terms of the so-called hidden Berry curvature, as well as material design principles. Hence, it gives rise to zero Berry curvature in momentum space but non-zero layer-locked hidden Berry curvature in real space. We show that, compared to that of a trivial insulator, the layer Hall effect is significantly enhanced in antiferromagnetic topological insulators. Our universal picture provides a paradigm for revealing the hidden physics as a result of the interplay between the global and local symmetries, and can be generalized in various scenarios.

关键词： layerHall effect hidden Berry curvature antiferromagnetic insulator axion insulator, quantum transport

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Enhanced near-room-temperature thermoelectric performance in GeTe

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Rare Metals 2022年第9期41卷 3027-3034页

作者： Xian Yi Tan Jin-Feng Dong Ning Jia Hong-Xia Zhang Rong Ji Ady Suwardi Zhi-Liang Li Qiang Zhu Jian-Wei Xu Qing-Yu Yan School of Materials Science and Engineering Nanyang Technological UniversitySingapore639798Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and ResearchSingapore138634Singapore Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei Province College of Physics Science and TechnologyHebei UniversityBaoding071002China

GeTe is an excellent mid-temperature thermoelectric material with high dimensionless figure of merit(ZT)values at temperatures over 600 *** near-room-temperature performance is less studied due to the intrinsic high carrier ***,we successfully enhance the Seebeck coefficient of GeTe from~30 to 220μV·K^(−1) at 300 K,which is achieved by AgInSe2 alloying and Bi *** is demonstrated that Bi doping helps to optimize the Seebeck coefficient without deteriorating the intrinsic electrical transport properties of the matrix.A high room-temperature power factor(PF)of~11μW·cm^(−1)·K^(−2) is achieved for a wide range of Bi-doped *** simultaneously introduced abundant point defects cause mass and strain fluctuations,which decrease the lattice thermal conductivity(κ_(L))to a low value of 0.6 W·m^(−1)·K^(−1) at 300 *** to the synergetic effects of Bi doping in AgInSe2-alloyed GeTe,a high room-temperature ZT value of 0.46 is obtained together with a high ZT value of 1.1 at 523 K.

关键词： Thermoelectric GeTe Thermal conductivity Room-temperature ZT

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A quantum "hole" is realized by SiGe device 9

A quantum "hole" is realized by SiGe device

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9th IEEE Hong Kong Electron Devices Meeting, HKEDM 2002

作者： Li, Yao Laboratory of Quantum Communication and Quantum Computation Department of Physics University of Science and Technology of China Hefei230026 China

ISBN: (纸本)0780374290

关键词： Semiconductor quantum dots

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The Quantum Internet (Technical Version)

arXiv

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arXiv 2025年

作者： Rohde, Peter P. Huang, Zixin Ouyang, Yingkai Huang, He-Liang Su, Zu-En Devitt, Simon Ramakrishnan, Rohit Mantri, Atul Tan, Si-Hui Liu, Nana Harrison, Scott Radhakrishnan, Chandrashekar Brennen, Gavin K. Baragiola, Ben Q. Dowling, Jonathan P. Byrnes, Tim Munro, William J. Centre for Quantum Software and Information Faculty of Engineering and Information Technology University of Technology Sydney SydneyNSW Australia Hearne Institute for Theoretical Physics Louisiana State University Baton Rouge United States School of Mathematical and Physical Sciences Macquarie University NSW2109 Australia School of Mathematical and Physical Sciences University of Sheffield SheffieldS3 7RH United Kingdom Henan Key Laboratory of Quantum Information and Cryptography Henan Zhengzhou450000 China Hefei National Laboratory for Physical Sciences at Microscale Department of Modern Physics University of Science & Technology of China Hefei China CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information & Quantum Physics University of Science & Technology of China Hefei China CAS-Alibaba Quantum Computing Laboratory Shanghai China InstituteQ Aalto University Espoo02150 Finland Indian Institute of Science Bangalore India Singapore University of Technology & Design Singapore Centre for Quantum Technologies National University of Singapore Singapore Horizon Quantum Ireland 24 Fitzwilliam Place Dublin 2 D02 T296 Ireland Institute of Natural Sciences Shanghai Jiao Tong University Shanghai200240 China School of Mathematical Sciences Shanghai Jiao Tong University Shanghai200240 China Ministry of Education Key Laboratory in Scientific and Engineering Computing Shanghai Jiao Tong University Shanghai200240 China Shanghai Artificial Intelligence Laboratory Shanghai China University of Michigan Shanghai Jiao Tong University Joint Institute Shanghai200240 China Leibniz Institute for Research & Information in Education Frankfurt am Main Germany Department of Computer Science and Engineering NYU Shanghai 567 West Yangsi Road Shanghai200124 China Centre of Excellence in Engineered Quantum Systems Macquarie University NSW Australia Centre for Quantum Computation and Communication Technology School of Science RMIT University VIC

The desire to share and unite remote digital assets motivated the development of the classical internet, the enabler of the entire 21st century economy and our modern way of life. As we enter the quantum era, it is to be expected there will be a similar demand for networking quantum assets, motivating a global quantum internet for bringing together the world's quantum resources, leveraging off their exponential trajectory in capability. We present models for quantum networking, how they might be applied in the future, and the implications they will have. Socially, economically, politically and geostrategically, the upcoming era of quantum supremacy will be as significant for the 21st century as the transistor was for the 20th. The inherently different scaling in the computational power of quantum computers fundamentally changes the dynamics of how they will operate in the future. Given their high expected initial cost, a client/server model for outsourcing computation will be essential for enabling the accessibility and proliferation of this technology, and ensuring its economic viability. We therefore anticipate the emergence of cloud quantum computing, a model for outsourcing quantum computations to the network. We argue that economic efficiency will mandate that all future quantum computers be united into a single global virtual quantum computer, offering exponentially more power to all network participants than if they were to keep their resources to themselves. This model for the allocation of computational resources is uniquely quantum, with no classical analogue, completely altering the economic landscape for the future of computation. Given the sensitivity of much of the data to which future quantum computers are going to foreseeably be applied, protocols for encrypted quantum computation will be essential - the outsourcing of computations that neither an eavesdropper nor even the server performing the computation can spy upon. This will enable new models fo

关键词： Outsourcing

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