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quantum 2.0, quantum 2024 in quantum 2.0 Conference and Exhibition

作者： Kawasaki, Akito Ide, Ryuhoh Brunel, Hector Suzuki, Takumi Nehra, Rajveer Nakashima, Katsuki Kashiwazaki, Takahiro Inoue, Asuka Umeki, Takeshi China, Fumihiro Yabuno, Masahiro Miki, Shigehito Terai, Hirotaka Yamashima, Taichi Sakaguchi, Atsushi Takase, Kan Endo, Mamoru Asavanant, Warit Furusawa, Akira Department of Applied Physics School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Department of Physics Ecole Normale Supérieure 24 rue Lhomond Paris75005 France Department of Electrical and Computer Engineering University of Massachusetts-Amherst AmherstMA01003 United States Department of Physics University of Massachusetts-Amherst AmherstMA01003 United States NTT Device Technology Labs NTT Corporation 3-1 Morinosato Wakamiya Kanagawa Atsugi243-0198 Japan Advanced ICR Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi Kobe651-2492 Japan Optical Quantum Computing Research Team RIKEN Center for Quantum Computing 2-1 Hirosawa Saitama Wako351-0198 Japan

We generate and observe optical non-Gaussian states defined in wavepackets of sub-nanosecond time width—O(103) faster than previous research—using waveguide optical parametric amplifier made of PPLN crystal, enablin... 详细信息

ISBN: (纸本)9781557525185

关键词： Parametric amplifiers

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Experimental quantum Homomorphic Encryption Using a quantum Photonic Chip

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Physical Review Letters 2024年第20期132卷 200801-200801页

作者： Yuan Li Lin Cao Wei Luo Hui Zhang Hong Cai Muhammad Faeyz Karim Feng Gao Joseph Fitzsimons Qinghua Song Ai-Qun Liu Institute of Quantum Technology (IQT) The Hong Kong Polytechnic University Hong Kong 11 Yuk Choi Rd Hung Hom Hong Kong Quantum Science and Engineering Centre (QSec) Nanyang Technological University 639798 Singapore Horizon Quantum Computing 79 Ayer Rajah Crescent BASH #03-01 139955 Singapore Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China

A fully homomorphic encryption system enables computation on encrypted data without the necessity for prior decryption. This facilitates the seamless establishment of a secure quantum channel, bridging the server and client components, and thereby providing the client with secure access to the server’s substantial computational capacity for executing quantum operations. However, traditional homomorphic encryption systems lack scalability, programmability, and stability. In this Letter, we experimentally demonstrate a proof-of-concept implementation of a homomorphic encryption scheme on a compact quantum chip, verifying the feasibility of using photonic chips for quantum homomorphic encryption. Our work not only provides a solution for circuit expansion, addressing the longstanding challenge of scalability while significantly reducing the size of quantum network infrastructure, but also lays the groundwork for the development of highly sophisticated quantum fully homomorphic encryption systems.

关键词： Optical quantum information processing Photonics quantum communication quantum cryptography quantum information processing quantum networks quantum optics quantum protocols

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Artificial Intelligence for the Classification of Neuromuscular Diseases Using Dominant MUAP 8

Artificial Intelligence for the Classification of Neuromuscu...

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8th International Conference on Smart Structures and Systems, ICSSS 2022

作者： Maheshwary, Priti Vinu, W. Velvadivu, P. Shukla, Surendra Kumar Srivastava, Prabhat Kumar Pareek, Prakash Centre for Internet of Things and Advance Computing Rabindranath Tagore University Bhopal India Annamalai University Department of Physical Education Tamilnadu Chidambaram India Coimbatore Institute of Technology Department of Computing-Data Science Tamilnadu Coimbatore India Graphic Era Deemed to Be University Department of Computer Science and Engineering Dehradun India Quantum University Department of Computer Science and Engineering Uttrakhand Roorkee India Vishnu Institute of Technology Department of Electronics and Communication Engineering Andhra Pradesh Bhimavaram India

ISBN: (纸本)9781665497619

Motor-unit-action-potentials in an electromyographic isolated signals shape & sounds are valuable diagnosis information for neuro-muscular disorders-treatment & management. An expert can analyse these parameters qualitatively or quantitative by pattern recognition techniques. Because of benefits of the quantitatively method of EMG, producing robust automated MUAP types is investigated, & many systems is produced for this purpose, but correctness of the previous methods isn't peak enough to use in clinical settings. The developed system uses an EMG signal decomposition mechanism to extract both time & frequency domain for M-U-A-P's retrieved from E-M-G. Un-similar type of algorithms was studied, including 1 & many types with many sub-sets characteristics. The multi-classifier methods proposed here performed well in experiments by real set EMG. The multi-classifier, which aggregates base classifiers using multiple feature sets & both trainable & non-trainable fusion techniques, performed the best of the methods studied, with an average precision is 98%. © 2022 IEEE.

关键词： Support vector machines Time-frequency analysis Shape Neuromuscular Morphology Electromyography Pattern recognition

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Dense Coding with Locality Restriction on Decoders: quantum Encoders versus Superquantum Encoders

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PRX quantum 2022年第3期3卷 030346-030346页

作者： Masahito Hayashi Kun Wang Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Graduate School of Mathematics Nagoya University Nagoya 464-8602 Japan Institute for Quantum Computing Baidu Research Beijing 100193 China

We investigate practical dense coding by imposing locality restrictions on decoders and symmetry restrictions on encoders within the resource theory of asymmetry framework. In this task, the sender Alice and the helper Fred preshare an entangled state. Alice encodes a classical message into the quantum state using a symmetric preserving encoder and sends the encoded state to Bob through a noiseless quantum channel. The receiver Bob and helper Fred are limited to performing quantum measurements satisfying certain locality restrictions to decode the classical message. We are interested in the ultimate dense coding capacity under these constraints. Our contributions are summarized as follows. First, we derive both one-shot and asymptotic optimal achievable transmission rates of the dense coding task under different encoder and decoder combinations. Surprisingly, our results reveal that the transmission rate cannot be improved even when the decoder is relaxed from one-way local operations and classical communication (LOCC) to two-way LOCC, separable measurements, and partial transpose positive measurements of the bipartite system. Second, depending on the class of allowed decoders with certain locality restrictions, we relax the class of encoding operations to superquantum encoders in the general probability theory framework and derive dense coding transmission rates under this setting. For example, when the decoder is fixed to a separable measurement, theoretically, a positive operation is allowed as an encoding operation. Remarkably, even under this superquantum relaxation, the transmission rate still cannot be lifted. This fact highlights the universal validity of our analysis on practical dense coding beyond quantum theory.

关键词： quantum channels quantum communication quantum entanglement Resource theories

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Investigation on the Mechanism of the Intense Heat Transfer Process with Oscillation Amplitude and Period Distribution for Helium-Based Oscillating Heat Pipe

SSRN

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SSRN 2024年

作者： Zhang, Jun Huang, Rui Ma, Changcheng Huo, Yi Wang, Xudi Cao, Qing College of Mechanical Engineering Hefei University of Technology Hefei230009 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Origin Quantum Computing Technology Co. Hefei 230088 China

Cryogenic superconductivity is crucial for new-generation high-tech applications such as particle accelerators and controllable nuclear fusion. However, the transfer rate of heat in the 4K region limits the improvement of cryogenic superconductivity performance. Currently, the effective thermal conductivity (ETC) of helium-based oscillating heat pipes (OHP) can reach 4000~16000 W·m-1·K-1. The mechanism of the intense heat transfer process of helium-based OHP in the 4K region is unclear, which restricts the application of OHP in cryogenic superconducting systems. In this study, a helium-based OHP was designed and fabricated. The test rig for the heat transfer performance and dynamic parameters of the oscillatory behavior of the OHP at the 4K region was built. A numerical simulation method for the gas-liquid two-phase unsteady flow process inside the OHP was constructed. The pressure pulsation amplitude and oscillation period distribution of the internal oscillation process of OHP are analyzed. The oscillation intensity to characterize the amplitude of the oscillation within the OHP is introduced. The frequency dispersion to characterize the frequency distribution of the oscillation behavior and broadband characteristics is introduced. Combined with the measured change rule of the thermal conductivity, the mechanism of the highest point of the thermal conductivity is revealed. © 2024, The Authors. All rights reserved.

关键词： Superconducting magnets

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Non-Gaussian States Generation Using a High-Speed Single-Pixel Superconducting Nano-Strip Photon-Number-Resolving Detector

Non-Gaussian States Generation Using a High-Speed Single-Pix...

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Takahashi, Kazuma Endo, Mamoru Nomura, Takefumi Sonoyama, Tatsuki Kashiwazaki, Takahiro Inoue, Asuka Umeki, Takeshi Yabuno, Masahiro China, Fumihiro Terai, Hirotaka Miki, Shigehito Nehra, Rajveer Takase, Kan Asavanant, Warit Furusawa, Akira Department of Applied Physics School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-8656 Japan Optical Quantum Computing Research Team RIKEN Center for Quantum Computing 2-1 Hirosawa Saitama Wako351-0198 Japan NTT Device Technology Labs. NTT Corporation 3-1 Morinosato Wakamiya Kanagawa Atsugi243-0198 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 Department of Electrical and Computer Engineering University of Massachusetts-Amherst AmherstMA01003 United States Department of Physics University of Massachusetts-Amherst AmherstMA01003 United States

ISBN: (纸本)9781957171395

We performed the first non-Gaussian state generation through two photon subtraction with a recently developed single-pixel superconducting nano-strip photon-number-resolving detector. We observed negative values of Wigner function of W(0,1.0) = -0.0072 ± 0.006 without loss correction. © 2024 The Author(s) © Optica Publishing Group 2024.

关键词： Photons

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YAQQ: Yet Another quantum Quantizer - Design Space Exploration of quantum Gate Sets using Novelty Search

arXiv

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arXiv 2024年

作者： Sarkar, Aritra Kundu, Akash Steinberg, Matthew Mishra, Sibasish Fauquenot, Sebastiaan Acharya, Tamal Miszczak, Jaroslaw A. Feld, Sebastian Quantum Intelligence research team Quantum Machine Learning research group Quantum Computing division QuTech Netherlands Department of Quantum & Computer Engineering Delft University of Technology Netherlands Joint Doctoral School Silesian University of Technology Gliwice Poland Institute of Theoretical and Applied Informatics Polish Academy of Sciences Gliwice Poland QTF Centre of Excellence Department of Physics University of Helsinki Finland

The standard model of quantum computation is based on quantum circuits, where the number and quality of the quantum gates composing the circuit influence the runtime and fidelity of the computation. The fidelity of the decomposition of quantum algorithms, represented as unitary matrices, to bounded depth quantum circuits depends strongly on the set of gates available for the decomposition routine. To investigate this dependence, we explore the design space of discrete quantum gate sets and present a software tool for comparative analysis of quantum processing units and control protocols based on their native gates. The evaluation is conditioned on a set of unitary transformations representing target use cases on the quantum processors. The cost function considers three key factors: (i) the statistical distribution of the decomposed circuits’ depth, (ii) the statistical distribution of process fidelities for the approximate decomposition, and (iii) the relative novelty of a gate set compared to other gate sets in terms of the aforementioned properties. The developed software, called YAQQ (Yet Another quantum Quantizer), enables the discovery of an optimized set of quantum gates through this tunable joint cost function. To identify these gate sets, we use the novelty search algorithm, circuit decomposition techniques (like Solovay-Kitaev, Cartan, and quantum Shannon decomposition), and stochastic optimization to implement YAQQ within the Qiskit quantum simulator environment. YAQQ exploits reachability tradeoffs conceptually derived from quantum algorithmic information theory. Our results demonstrate the pragmatic application of identifying gate sets that are advantageous to popularly used quantum gate sets in representing quantum algorithms. Consequently, we demonstrate pragmatic use cases of YAQQ in comparing transversal logical gate sets in quantum error correction codes, designing optimal quantum instruction sets, and compiling to specific quantum processors. © 202

关键词： Cost functions

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Frustrated Magnetic Interactions and Quenched Spin Fluctuations in CrAs

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Chinese Physics Letters 2022年第12期39卷 89-93页

作者： Yayuan Qin Yao Shen Yiqing Hao Hongliang Wo Shoudong Shen Russell A.Ewings Yang Zhao Leland W.Harriger Jeffrey W.Lynn Jun Zhao State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Shanghai Qizhi Institute Shanghai 200232China ISIS Pulsed Neutron and Muon Source STFC Rutherford Appleton LaboratoryHarwell CampusDidcotOxonOX110QXUnited Kingdom NIST Center for Neutron Research National Institute of Standards and TechnologyGaithersburgMD 20899USA Department of Materials Science and Engineering University of MarylandCollege ParkMD 20742USA Institute of Nanoelectronics and Quantum Computing Fudan UniversityShanghai 200433China Shanghai Research Center for Quantum Sciences Shanghai 201315China

The discovery of pressure-induced superconductivity in helimagnets(CrAs,MnP)has attracted considerable interest in understanding the relationship between complex magnetism and unconventional ***,the nature of the magnetism and magnetic interactions that drive the unusual double-helical magnetic order in these materials remains ***,we report neutron scattering measurements of magnetic excitations in CrAs single crystals at ambient *** experiments reveal well defined spin wave excitations up to about 150 meV with a pseudogap below 7 meV,which can be effectively described by the Heisenberg model with nearest neighbor exchange *** surprisingly,the spin excitations are largely quenched above the Néel temperature,in contrast to cuprates and iron pnictides where the spectral weight is mostly preserved in the paramagnetic *** results suggest that the helimagnetic order is driven by strongly frustrated exchange interactions,and that CrAs is at the verge of itinerant and correlation-induced localized states,which is therefore highly pressure-tunable and favorable for superconductivity.

关键词： excitation exchange pressure

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Optical waveform engineering of non-Gaussian states

Optical waveform engineering of non-Gaussian states

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2023 Conference on Lasers and Electro-Optics Europe and European quantum Electronics Conference, CLEO/Europe-EQEC 2023

作者： Kawasaki, Akito Takase, Kan Jeong, Byung Kyu Kashiwazaki, Takahiro Kazama, Takushi Enbutsu, Koji Watanabe, Kei Umeki, Takeshi Miki, Shigehito 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 Optical Quantum Computing Research Team RIKEN Center for Quantum Computing 2-1 Hirosawa Saitama Wako351-0198 Japan NTT Device Technology Labs NTT Corporation 3-1 Morinosato Wakamiya Kanagawa Atsugi243-0198 Japan Graduate School of Engineering Kobe University 1-1 Rokkodai-cho Nada-ku Hyogo Kobe657-0013 Japan Advanced ICT Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi-ku Hyogo Kobe651-2492 Japan

ISBN: (纸本)9798350345995

Toward the realization of quantum information processing (QIP), continuous-variable (CV) system is a promising candidate, where scalable quantum information processors are already demonstrated [1]. The next milestone is the demonstration of universality and fault-tolerance on these processors by injecting highly non-classical quantum states, non-Gaussian states (NGSs), with a proper temporal waveform [2]. NGSs are very fragile to optical losses, however, and engineering temporal waveform of NGSs is a quite nontrivial task that requires completely different methodology from conventional optical wave shaping. © 2023 IEEE.

关键词： Fault tolerance

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Demonstrating a Long-Coherence Dual-Rail Erasure Qubit Using Tunable Transmons

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Physical Review X 2024年第1期14卷 011051-011051页

作者： H. Levine A. Haim J. S. C. Hung N. Alidoust M. Kalaee L. DeLorenzo E. A. Wollack P. Arrangoiz-Arriola A. Khalajhedayati R. Sanil H. Moradinejad Y. Vaknin A. Kubica D. Hover S. Aghaeimeibodi J. A. Alcid C. Baek J. Barnett K. Bawdekar P. Bienias H. A. Carson C. Chen L. Chen H. Chinkezian E. M. Chisholm A. Clifford R. Cosmic N. Crisosto A. M. Dalzell E. Davis J. M. D’Ewart S. Diez N. D’Souza P. T. Dumitrescu E. Elkhouly M. T. Fang Y. Fang S. Flammia M. J. Fling G. Garcia M. K. Gharzai A. V. Gorshkov M. J. Gray S. Grimberg A. L. Grimsmo C. T. Hann Y. He S. Heidel S. Howell M. Hunt J. Iverson I. Jarrige L. Jiang W. M. Jones R. Karabalin P. J. Karalekas A. J. Keller D. Lasi M. Lee V. Ly G. MacCabe N. Mahuli G. Marcaud M. H. Matheny S. McArdle G. McCabe G. Merton C. Miles A. Milsted A. Mishra L. Moncelsi M. Naghiloo K. Noh E. Oblepias G. Ortuno J. C. Owens J. Pagdilao A. Panduro J.-P. Paquette R. N. Patel G. Peairs D. J. Perello E. C. Peterson S. Ponte H. Putterman G. Refael P. Reinhold R. Resnick O. A. Reyna R. Rodriguez J. Rose A. H. Rubin M. Runyan C. A. Ryan A. Sahmoud T. Scaffidi B. Shah S. Siavoshi P. Sivarajah T. Skogland C.-J. Su L. J. Swenson J. Sylvia S. M. Teo A. Tomada G. Torlai M. Wistrom K. Zhang I. Zuk A. A. Clerk F. G. S. L. Brandão A. Retzker O. Painter AWS Center for Quantum Computing Pasadena California 91125 USA Institute of Applied Physics The Hebrew University of Jerusalem Jerusalem 91904 Givat Ram Israel Racah Institute of Physics The Hebrew University of Jerusalem Jerusalem 91904 Givat Ram Israel Centre for Engineered Quantum Systems School of Physics The University of Sydney Sydney New South Wales 2006 Australia Pritzker School of Molecular Engineering University of Chicago Chicago Illinois 60637 USA Institute for Quantum Information and Matter California Institute of Technology Pasadena California 91125 USA Department of Physics California Institute of Technology Pasadena California 91125 USA Thomas J. Watson Sr. Laboratory of Applied Physics and Kavli Nanoscience Institute California Institute of Technology Pasadena California 91125 USA

quantum error correction with erasure qubits promises significant advantages over standard error correction due to favorable thresholds for erasure errors. To realize this advantage in practice requires a qubit for which nearly all errors are such erasure errors, and the ability to check for erasure errors without dephasing the qubit. We demonstrate that a “dual-rail qubit” consisting of a pair of resonantly coupled transmons can form a highly coherent erasure qubit, where transmon T1 errors are converted into erasure errors and residual dephasing is strongly suppressed, leading to millisecond-scale coherence within the qubit subspace. We show that single-qubit gates are limited primarily by erasure errors, with erasure probability perasure=2.19(2)×10−3 per gate while the residual errors are ∼40 times lower. We further demonstrate midcircuit detection of erasure errors while introducing <0.1% dephasing error per check. Finally, we show that the suppression of transmon noise allows this dual-rail qubit to preserve high coherence over a broad tunable operating range, offering an improved capacity to avoid frequency collisions. This work establishes transmon-based dual-rail qubits as an attractive building block for hardware-efficient quantum error correction.

关键词： quantum computation quantum error correction quantum information with solid state qubits

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