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arXiv 2021年

作者： Chu, Ji He, Xiaoyu Zhou, Yuxuan Yuan, Jiahao Zhang, Libo Guo, Qihao Hai, Yongju Han, Zhikun Hu, Chang-Kang Huang, Wenhui Jia, Hao Jiao, Dawei Liu, Yang Ni, Zhongchu Pan, Xianchuang Qiu, Jiawei Wei, Weiwei Yang, Zusheng Zhang, Jiajian Zhang, Zhida Zou, Wanjing Chen, Yuanzhen Deng, Xiaowei Deng, Xiuhao Hu, Ling Li, Jian Tan, Dian Xu, Yuan Yan, Tongxing Sun, Xiaoming Yan, Fei Yu, Dapeng Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Guangdong Shenzhen China International Quantum Academy Guangdong Shenzhen China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Guangdong Shenzhen China Institute of Computing Technology Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China Department of Physics Southern University of Science and Technology Guangdong Shenzhen China

Implementing quantum algorithms on realistic hardware requires translating high-level global operations into sequences of native elementary gates, a process known as quantum compiling. Physical limitations, such as constraints in connectivity and gate alphabets, often result in unacceptable implementation costs. To enable successful near-term applications, it is crucial to optimize compilation by exploiting the potential capabilities of existing hardware. Here, we implement a resource-efficient construction for a quantum version of AND logic that can reduce the cost, enabling the execution of key quantum circuits. On a high-scalability superconducting quantum processor, we demonstrate low-depth synthesis of high-fidelity generalized Toffoli gates with up to 8 qubits and Grover's search algorithm in a search space of up to 64 entries;both are the largest such implementations in scale to date. Our experimental demonstration illustrates a scalable implementation of simplifying quantum algorithms, paving the way for larger, more meaningful quantum applications on noisy devices. Copyright © 2021, The Authors. All rights reserved.

关键词： quantum theory

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Distributed exact quantum algorithms for Bernstein-Vazirani and search problems

arXiv

引用

arXiv 2023年

作者： Zhou, Xu Qiu, Daowen Luo, Le Institute of Quantum Computing and Computer Theory School of Computer Science and Engineering Sun Yat-sen University Guangzhou510006 China The Guangdong Key Laboratory of Information Security Technology Sun Yat-sen University Guangzhou510006 China School of Physics and Astronomy Sun Yat-sen University Zhuhai519082 China QUDOOR Technologies Inc. Zhuhai519099 China

Distributed quantum computation has gained extensive attention since small-qubit quantum computers seem to be built more practically in the noisy intermediate-scale quantum (NISQ) era. In this paper, we give a distributed Bernstein-Vazirani algorithm (DBVA) with t computing nodes, and a distributed exact Grover’s algorithm (DEGA) that solve the search problem with only one target item in the unordered databases. Though the designing techniques are simple in the light of BV algorithm, Grover’s algorithm, the improved Grover’s algorithm by Long, and the distributed Grover’s algorithm by Qiu et al, in comparison to BV algorithm, the circuit depth of DBVA is not greater than 2max(n0,n1,··· ,nt−1) + 3 instead of 2n + 3, and the circuit depth of DEGA is 8(n mod 2) + 9, which is less than the circuit depth of Grover’s algorithm, (formula presented). In particular, we provide situations of our DBVA and DEGA on Mindquantum (a quantum software) to validate the correctness and practicability of our methods. By simulating the algorithms running in the depolarized channel, it further illustrates that distributed quantum algorithm has superiority of resisting noise. Copyright © 2023, The Authors. All rights reserved.

关键词： quantum theory

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Heralded nonlocal quantum gates for distributed quantum computation in a decoherence-free subspace

arXiv

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arXiv 2023年

作者： Su, Wanhua Qin, Wei Miranowicz, Adam Li, Tao Nori, Franco MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing School of Physics Nanjing University of Science and Technology Nanjing210094 China Center for Joint Quantum Studies Department of Physics School of Science Tianjin University Tianjin300350 China Theoretical Quantum Physics Laboratory Cluster for Pioneering Research RIKEN Wakoshi Saitama351-0198 Japan Institute of Spintronics and Quantum Information Faculty of Physics and Astronomy Adam Mickiewicz University PoznanPL-61-614 Poland Engineering Research Center of Semiconductor Device Optoelectronic Hybrid Integration in Jiangsu Province Nanjing210094 China Quantum Information Physics Theory Research Team Quantum Computing Center RIKEN Saitama Wako-shi351-0198 Japan Physics Department The University of Michigan Ann ArborMI48109-1040 United States

We propose a heralded protocol for implementing nontrivial quantum gates on two stationary qubits coupled to spatially separated cavities. By dynamically controlling the evolution of the composite system, nonlocal two-qubit quantum (e.g., CPHASE and CNOT) gates can be achieved without real excitations of either cavity modes or atoms. The success of our protocol is conditioned on projecting an auxiliary atom onto a postselected state, which simultaneously removes various detrimental effects of dissipation on the gate fidelity. In principle, the success probability of the gate can approach unity as the single-atom cooperativity becomes sufficiently large. Furthermore, we show its application for implementing single- and two-qubit gates within a decoherence-free subspace that is immune to a collective dephasing noise. This faithful, heralded, and nonlocal protocol could, therefore, be useful for distributed quantum computation and scalable quantum networks. © 2023, CC BY.

关键词： Qubits

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SpinQ Triangulum: a commercial three-qubit desktop quantum computer

arXiv

引用

arXiv 2022年

作者： Feng, Guanru Hou, Shi-Yao Zou, Hongyang Shi, Wei Yu, Sheng Sheng, Zikai Rao, Xin Ma, Kaihong Chen, Chenxing Ren, Bing Miao, Guoxing Xiang, Jingen Zeng, Bei Shenzhen SpinQ Technology Co. Ltd. Shenzhen China College of Physics and Electronic Engineering Center for Computational Sciences Sichuan Normal University Chengdu China Institute for Quantum Computing University of Waterloo WaterlooON Canada Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong

SpinQ Triangulum is the second generation of the desktop quantum computers designed and manufactured by SpinQ technology. SpinQ’s desktop quantum computer series, based on room temperature NMR spectrometer, provide light-weighted, cost-effective and maintenance-free quantum computing platforms that aim to provide real-device experience for quantum computing education for K-12 and college level. These platforms also feature quantum control design capabilities for studying quantum control and quantum noise. Compared with the first generation product, the two-qubit SpinQ Gemini, Triangulum features a three-qubit QPU, smaller dimensions (61 × 33 × 56 cm3) and lighter (40 kg). Furthermore, the magnetic field is more stable and the performance of quantum control is more accurate. This paper introduces the system design of Triangulum and its new features. As an example of performing quantum computing tasks, we present the implementation of the Harrow-Hassidim-Lloyd (HHL) algorithm on Triangulum, demonstrating Triangulum’s capability of undertaking complex quantum computing tasks. SpinQ will continue to develop desktop quantum computing platform with more qubits. Meanwhile, a simplified version of SpinQ Gemini, namely Gemini Mini a , has been recently realised. Gemini Mini is much more portable (20 × 35 × 26 cm3, 14 kg) and affordable for most K-12 schools around the world. Copyright © 2022, The Authors. All rights reserved.

关键词： Cost effectiveness

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Generation of Highly Pure Single-Photon State at Telecommunication Wavelength

arXiv

引用

arXiv 2022年

作者： Kawasaki, Akito Takase, Kan Nomura, Takefumi Miki, Sigehito Terai, Hirotaka Yabuno, Masahiro China, Fumihiro Asavanant, Warit Endo, Mamoru Yoshikawa, Jun-Ichi Furusawa, Akira Department of Applied Physics School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Advanced ICT Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi-ku Hyogo Kobe651-2492 Japan Graduate School of Engineering Kobe University 1-1 Rokkodai-cho Nada-ku Hyogo Kobe657-0013 Japan Optical Quantum Computing Research Team RIKEN center for Quantum Computing 2-1 Hirosawa Saitama Wako351-0198 Japan

Telecommunication wavelength with well-developed optical communication technologies and low losses in the waveguide are advantageous for quantum applications. However, an experimental generation of non-classical states called non-Gaussian states at the telecommunication wavelength is still underdeveloped. Here, we generate highly-pure-single-photon states, one of the most primitive non-Gaussian states, by using a heralding scheme with an optical parametric oscillator and a superconducting nano-strip photon detector. The Wigner negativity, the indicator of non-classicality, of the generated single photon state is -0.228 ± 0.004, corresponded to 85.1 ± 0.7% of single photon and the best record of the minimum value at all wavelengths. The quantum-optics-technology we establish can be easily applied to the generation of various types of quantum states, opening up the possibility of continuous-variable-quantum-information processing at the telecommunication wavelength. Copyright © 2022, The Authors. All rights reserved.

关键词： quantum optics

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quantum Microwave Parametric Interferometer

引用

Physical Review Applied 2023年第2期20卷 024049-024049页

作者： F. Kronowetter F. Fesquet M. Renger K. Honasoge Y. Nojiri K. Inomata Y. Nakamura A. Marx R. Gross K.G. Fedorov Walther-Meißner-Institut Bayerische Akademie der Wissenschaften Garching 85748 Germany School of Natural Sciences Technische Universität München Garching 85748 Germany Rohde & Schwarz GmbH & Co. KG Munich 81671 Germany RIKEN Center for Quantum Computing (RQC) Wako Saitama 351-0198 Japan National Institute of Advanced Industrial Science and Technology 1-1-1 Umezono Tsukuba Ibaraki 305-8563 Japan Department of Applied Physics Graduate School of Engineering The University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Munich Center for Quantum Science and Technology (MCQST) Munich 80799 Germany

Classical interferometers are indispensable tools for the precise determination of various physical quantities. Their accuracy is bound by the standard quantum limit. This limit can be overcome by using quantum states or nonlinear quantum elements. Here, we present the experimental study of a nonlinear Josephson interferometer operating in the microwave regime. Our quantum microwave parametric interferometer (QUMPI) is based on superconducting flux-driven Josephson parametric amplifiers combined with linear microwave elements. We perform a systematic analysis of the implemented QUMPI. We find that its interferometric power exceeds the shot-noise limit and observe sub-Poissonian photon statistics in the output modes. Furthermore, we identify a low-gain operation regime of the QUMPI that is essential for optimal quantum measurements in quantum illumination protocols.

关键词： Nonlinear optics Optoelectronics quantum metrology Superconducting quantum optics Josephson junctions Optical parametric oscillators & amplifiers Microwave techniques Optical interferometry

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Factoring integers with sublinear resources on a superconducting quantum processor

arXiv

引用

arXiv 2022年

作者： Yan, Bao Tan, Ziqi Wei, Shijie Jiang, Haocong Wang, Weilong Wang, Hong Luo, Lan Duan, Qianheng Liu, Yiting Shi, Wenhao Fei, Yangyang Meng, Xiangdong Han, Yu Shan, Zheng Chen, Jiachen Zhu, Xuhao Zhang, Chuanyu Jin, Feitong Li, Hekang Song, Chao Wang, Zhen Ma, Zhi Wang, H. Long, Gui-Lu State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450001 China State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China School of Physics ZJU-Hangzhou Global Scientific and Technological Innovation Center Interdisciplinary Center for Quantum Information Zhejiang Province Key Laboratory of Quantum Technology and Device Zhejiang University Hangzhou310000 China Beijing Academy of Quantum Information Sciences Beijing100193 China Institute of Information Technology Information Engineering University Zhengzhou450001 China Beijing National Research Center for Information Science and Technology School of Information Tsinghua University Beijing100084 China Frontier Science Center for Quantum Information Beijing100084 China

Shor’s algorithm has seriously challenged information security based on public key cryptosystems. However, to break the widely used RSA-2048 scheme, one needs millions of physical qubits, which is far beyond current technical capabilities. Here, we report a universal quantum algorithm for integer factorization by combining the classical lattice reduction with a quantum approximate optimization algorithm (QAOA). The number of qubits required is O(logN/loglogN), which is sublinear in the bit length of the integer N, making it the most qubit-saving factorization algorithm to date. We demonstrate the algorithm experimentally by factoring integers up to 48 bits with 10 superconducting qubits, the largest integer factored on a quantum device. We estimate that a quantum circuit with 372 physical qubits and a depth of thousands is necessary to challenge RSA-2048 using our algorithm. Our study shows great promise in expediting the application of current noisy quantum computers, and paves the way to factor large integers of realistic cryptographic significance. © 2022, CC BY-NC-ND.

关键词： Qubits

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Disorder-induced pronounced magnetoresistive hysteresis in Josephson junctions

引用

Physical Review B 2025年第13期111卷 134513-134513页

作者： Yu Wu Daiqiang Huang Huanyu Zhang Anita Guarino Rosalba Fittipaldi Chao Ma Wenjie Hu Chang Niu Zhen Wang Weichao Yu Yuriy Yerin Antonio Vecchione Yang Liu Mario Cuoco Hangwen Guo Jian Shen State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 People's Republic of China Department of Physics Fudan University Shanghai 200433 People's Republic of China Shanghai Aerospace Control Technology Institute Shanghai 201109 People's Republic of China International Center for Quantum Materials Peking University Beijing 100871 People's Republic of China CNR-SPIN c/o Universitá di Salerno I-84084 Fisciano (SA) Italy College of Materials Science and Engineering Hunan University Changsha 410082 People's Republic of China Department of Physics University of Science and Technology of China Hefei Anhui 230026 Peoples Republic of China CNR-SPIN via del Fosso del Cavaliere 100 00133 Roma Italy Hefei National Laboratory Hefei 230088 People's Republic of China Zhangjiang Fudan International Innovation Center Fudan University Shanghai 201210 People's Republic of China Shanghai Research Center for Quantum Sciences Shanghai 201315 People's Republic of China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 People's Republic of China

The relation between superconductivity and time-reversal symmetry is one of the most fascinating problems in condensed-matter physics. Here we report an anomalous transport behavior in superconducting Josephson junctions induced by surface disorder. We fabricate vertical Josephson junctions using metallic superconductor (Al) and ion-bombarded Sr2RuO4. Below the superconducting transition temperature, we observe persistent magnetoresistive hysteresis behavior dependent on the disorder deposition time. Field- and temperature-dependent measurements suggest that the observed effects arise from disorder-induced anomalous flux in Sr2RuO4 which can be sensitively detected by superconducting Al. To account for the observed findings, we consider different physical scenarios such as interband surface pairing reconstruction, magnetic surface states, and vortex phases.

关键词： Hysteresis

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Spinfoam on a Lefschetz thimble: Markov chain Monte Carlo computation of a Lorentzian spinfoam propagator

引用

Physical Review D 2021年第8期103卷 084026-084026页

作者： Muxin Han Zichang Huang Hongguang Liu Dongxue Qu Yidun Wan State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Department of Physics Center for Field Theory and Particle Physics Institute for Nanoelectronic devices and Quantum computing Fudan University Shanghai 200433 China and Department of Physics and Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China

We compute numerically the Lorentzian Engle-Pereira-Rovelli-Livine spinfoam propagator on a 4-simplex, by adapting the Lefschetz thimble and Markov chain Monte-Carlo methods to oscillatory spinfoam integrals. Our method can compute any spinfoam observables at relatively large spins. We obtain the numerical results of the propagators at different spins and demonstrate their consistency with the expected spinfoam semiclassical behavior in the large spin limit. Our results exhibit significant quantum corrections at smaller spins. Our method is reliable and thus can be employed to discover the semiclassical and quantum behaviors of the spinfoam model.

关键词： Loop quantum gravity

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Tuning atom-field interaction via phase shaping

arXiv

引用

arXiv 2023年

作者： Cheng, Y.-T. Chien, C.-H. Hsieh, K.-M. Huang, Y.-H. Wen, P.Y. Lin, W.-J. Lu, Y. Aziz, F. Lee, C.-P. Lin, K.-T. Chen, C.-Y. Chen, J.C. Chuu, C.-S. Kockum, A.F. Lin, G.-D. Lin, Y.-H. Hoi, I.-C. Department of Physics National Tsing Hua University Hsinchu30013 Taiwan Department of Physics National Chung Cheng University Chiayi621301 Taiwan Chalmers University of Technology GothenburgSE-412 96 Sweden Department of Physics Center for Quantum Science and Engineering National Taiwan University Taipei10617 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Center for Quantum Technology National Tsing Hua University Hsinchu30013 Taiwan Trapped-Ion Quantum Computing Laboratory Hon Hai Research Institute Taipei11492 Taiwan Department of Physics City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong

A coherent electromagnetic field can be described by its amplitude, frequency, and phase. All these properties can influence the interaction between the field and an atom. Here we demonstrate the phase shaping of microwaves that are scattered by a superconducting artificial atom coupled to the end of a semi-infinite 1D transmission line. In particular, we input a weak exponentially rising pulse with phase modulation to a transmon qubit. We observe that field-atom interaction can be tuned from nearly full interaction (interaction efficiency, i.e., amount of the field energy interacting with the atom, of 94.5 %) to effectively no interaction (interaction efficiency 3.5 %). Copyright © 2023, The Authors. All rights reserved.

关键词： Atoms

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