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quantum oscillation in Hopf-link semimetals

Physical Review B 2025年第20期111卷 L201103-L201103页

作者： Lei Shi Xiaoxiong Liu C. M. Wang Tianyu Liu Hai-Zhou Lu X. C. Xie State Key Laboratory of Quantum Functional Materials Department of Physics and Guangdong Basic Research Center of Excellence for Quantum Science Southern University of Science and Technology (SUSTech) Shenzhen 518055 China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen 518045 China Department of Physics Shanghai Normal University Shanghai 200234 China International Quantum Academy Shenzhen 518048 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen 518055 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China Hefei National Laboratory Hefei 230088 China

Since the discovery of the relation between the Chern number and quantum Hall effect, searching for observables of topological invariants has been an intriguing topic. Topological Hopf-link semimetals have attracted tremendous interest, in which the conduction and valence energy bands touch at linked nodal lines. However, it is challenging to identify this sophisticated topology. We propose to use the quantum oscillation in strong magnetic fields to probe the Hopf links. For a generic model of a Hopf-link semimetal that captures the linked-trivial phase transition, we figure out the phase shifts of oscillation for all Fermi pockets in all magnetic-field directions, by presenting self-consistent results from the Fermi-surface tomography, Landau fan diagram, and electrical resistivity. As the magnetic field is rotated, the phase shifts exhibit a unique pattern, which could help to identify Hopf links in real materials, such as those in Li2NaN.

关键词： Hall effect

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Optimal Second-Order Rates for quantum Soft Covering and Privacy Amplification

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IEEE Transactions on Information Theory 2024年第7期70卷 5077-5091页

作者： Shen, Yu-Chen Gao, Li Cheng, Hao-Chung National Taiwan University Department of Electrical Engineering Taipei10617 Taiwan University of Houston Department of Mathematics HoustonTX77204 United States Graduate Institute of Communication Engineering Department of Mathematics Institute of Applied Mathematical Sciences Center for Quantum Science and Engineering National Taiwan University Department of Electrical Engineering Taipei10617 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Quantum Computing Center New Taipei City23678 Taiwan

We study quantum soft covering and privacy amplification against quantum side information. The former task aims to approximate a quantum state by sampling from a prior distribution and querying a quantum channel. The latter task aims to extract uniform and independent randomness against quantum adversaries. For both tasks, we use trace distance to measure the closeness between the processed state and the ideal target state. We show that the minimal amount of samples for achieving an \varepsilon -covering is given by the (1-\varepsilon ) -hypothesis testing information (with additional logarithmic additive terms), while the maximal extractable randomness for an \varepsilon -secret extractor is characterized by the conditional (1-\varepsilon ) -hypothesis testing entropy. When performing independent and identical repetitions of the tasks, our one-shot characterizations lead to tight asymptotic expansions of the above-mentioned operational quantities. We establish their second-order rates given by the quantum mutual information variance and the quantum conditional information variance, respectively. Moreover, our results extend to the moderate deviation regime, which are the optimal asymptotic rates when the trace distances vanish at sub-exponential speed. Our proof technique is direct analysis of trace distance without smoothing. © 1963-2012 IEEE.

关键词： Hash functions

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Integer multiple quantum image scaling based on NEQR and bicubic interpolation

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Chinese Physics B 2024年第4期33卷 259-273页

作者：蔡硕周日贵罗佳陈思哲 College of Information Engineering Shanghai Maritime UniversityShanghai 201306China Research Center of Intelligent Information Processing and Quantum Intelligent Computing Shanghai 201306China College of Merchant Marine Shanghai Maritime UniversityShanghai 201306China School of Mathematics and Computational Science Shangrao Normal UniversityShangrao 334001China

As a branch of quantum image processing,quantum image scaling has been widely ***,most of the existing quantum image scaling algorithms are based on nearest-neighbor interpolation and bilinear interpolation,the quantum version of bicubic interpolation has not yet been *** this work,we present the first quantum image scaling scheme for bicubic interpolation based on the novel enhanced quantum representation(NEQR).Our scheme can realize synchronous enlargement and reduction of the image with the size of 2^(n)×2^(n) by integral ***,the image is represented by NEQR and the original image coordinates are obtained through multiple CNOT ***,16 neighborhood pixels are obtained by quantum operation circuits,and the corresponding weights of these pixels are calculated by quantum arithmetic ***,a quantum matrix operation,instead of a classical convolution operation,is used to realize the sum of convolution of these *** simulation experiments and complexity analysis,we demonstrate that our scheme achieves exponential speedup over the classical bicubic interpolation algorithm,and has better effect than the quantum version of bilinear interpolation.

关键词： quantum image processing image scaling bicubic interpolation quantum circuit

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quantum characteristics near event horizons

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Physical Review D 2024年第6期110卷 064001页

作者： Asad Ali Saif Al-Kuwari Mehrdad Ghominejad M. T. Rahim Dong Wang Saeed Haddadi Qatar Centre for Quantum Computing College of Science and Engineering Faculty of Physics School of Physics and Optoelectronics Engineering

We investigate quantum characteristics around Schwarzschild black hole, exploring various quantum resources and their interplay in curved space-time. Our analysis reveals intriguing behaviors of quantum coherence, global and genuine multipartite entanglement, first-order coherence, and mutual information in different scenarios. Initially, we consider three particles shared among Alice, Bob, and Charlie in a Minkowski space far from the event horizon, where these particles are correlated via Greenberger-Horne-Zeilinger-type correlation. While Alice’s particle remains in Minkowski space, Bob and Charlie accelerate towards the event horizon, experiencing black hole evaporation and generating antiparticles correlated via the Hawking effect. We employ the Kruskal basis formulation to derive a pentapartite pure state shared among particles inside and outside the event horizon. Investigating different scenarios among particles both inside and outside the event horizon, we observe how quantum resources evolve and distribute among consideration of different particles with Hawking temperature and mode frequency. The trade-off relationship between first-order coherence and concurrence fill persists, indicating the intricate interplay between coherence and entanglement. Notably, the mutual information between external observers and particles inside the black hole becomes nonzero, deepening our understanding of quantum effects in curved space-time and shedding light on the quantum nature of the black hole. We believe that these findings will pave the way for future investigations into the fundamental quantum mechanical aspects of gravity under extreme environments.

关键词： quantum information processing Relativistic quantum information quantum aspects of black holes

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quantum Rabin oblivious transfer using two pure states

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Physical Review Research 2024年第4期6卷 043004页

作者： Lara Stroh James T. Peat Mats Kroneberg Ittoop V. Puthoor Erika Andersson SUPA Institute of Photonics and Quantum Sciences School of Engineering and Physical Sciences School of Computing

Oblivious transfer between two untrusting parties is an important primitive in cryptography. There are different variants of oblivious transfer. In Rabin oblivious transfer, the sender Alice holds a bit, and the receiver Bob either obtains the bit, or obtains no information with probability p?. Alice should not know whether or not Bob obtained the bit. We examine a quantum Rabin oblivious transfer (OT) protocol that uses two pure states. Investigating different cheating scenarios for the sender and for the receiver, we determine optimal cheating probabilities in each case. Comparing the quantum Rabin oblivious transfer protocol to classical Rabin oblivious transfer protocols, we show that the quantum protocol outperforms classical protocols, which do not use a third party, for some values of p?. We find that quantum Rabin OT protocols that use mixed states can outperform quantum Rabin OT protocols that use pure states for some values of p?.

关键词： quantum communication quantum cryptography quantum protocols

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Efficient Data Loading with quantum Autoencoder 48

Efficient Data Loading with Quantum Autoencoder

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48th IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2023

作者： Wu, Siang-Ruei Li, Chun-Tse Cheng, Hao-Chung Department of Electrical Engineering Graduate Institute of Communication Engineering National Taiwan University Taiwan Center for Quantum Science and Engineering National Taiwan University Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Quantum Computing Center United Kingdom

ISBN: (纸本)9781728163277

Faithfully loading classical data into a quantum system is a core problem in quantum machine learning and various quantum information processing tasks. In this work, we propose an efficient quantum autoencoder architecture that can construct a quantum state approximating the unknown classical distribution with high precision and with only linear circuit depth. Simulation experiments show that our proposed method substantially outperforms state-of-the-art methods on a wide range of datasets by evaluating divergences between the loaded distributions and the target distribution, and it also enjoys a faster convergence rate and stability. Moreover, the proposed scheme can be efficiently implemented on near-term hybrid classical-quantum systems with very shallow circuit depths. © 2023 IEEE.

关键词： Machine learning

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Non-Gaussian State Generation Using A Photon Detector With Finite Timing Jitter

Non-Gaussian State Generation Using A Photon Detector With F...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Sonoyama, Tatsuki Asavanant, Warit Takase, Kan Fukui, Kosuke 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

We formulate for the first time the effect of photon detector's timing j itter on non-Gaussian state generation. As a result, we obtain the quantitative relation between the jitter and the fidelity of the generate... 详细信息

ISBN: (纸本)9781957171258

关键词： Timing jitter

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Multiphoton Excitation Schemes in Carbon Nanotube Bright and Dark Excitons

Multiphoton Excitation Schemes in Carbon Nanotube Bright and...

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2024 Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024

作者： Yang, HeeBong Kim, Na Young Institute for Quantum Computing Department of Electrical and Computer Engineering Waterloo Institute for Nanotechnology University of Waterloo WaterlooONN2L 3G1 Canada

We investigate the rich photophysics among many bright and dark exciton states in carbon nanotubes. We propose a multiphoton excitation scheme to optically pump trapped populations in dark exciton states to enhance em... 详细信息

关键词： Excitons

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A BIBLIOMETRIC ANALYSIS ON FINTECH AND DIGITAL FINANCE USING VISUALIZING NETWORK

A BIBLIOMETRIC ANALYSIS ON FINTECH AND DIGITAL FINANCE USING...

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2024 International Conference on Sustainable computing and Integrated Communication in Changing Landscape of AI, ICSCAI 2024

作者： Upadhyay, Aryan Yadav, Vijay K. Tyagi, Vikas Agarwal, Varya School of Management & Commerce Dev Bhoomi Uttarakhand University Dehradun India Lloyd Institute of Engineering & Technology Greater Noida India Department of Basic computing Quantum University India

ISBN: (纸本)9798350355338

Financial Technology (FinTech) the new innovation in technological and financial field that is revolutionizing and improving the automation of delivery and use of financial services. FinTech has attracted wide attention for the benefits that’s come hand in hand with this new technology and has also gained wide recognition because of the increase in financial literacy over the last 5 years. From 2018 to 2022, the services of fintech shifted toward being consumer-oriented. This new industry now includes sectors like retail banking, investment management, education, and nonprofit organizations,Fintech is also developing to adaptive to be used for crypto-currencies and NFT’s. The paper will expand on the argument of taking a proactive role in adoption of FinTech and how it will benefit the an average individual. © 2024 IEEE.

关键词： Decentralized finance

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Dynamical-invariant-based holonomic quantum gates:Theory and experiment

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Fundamental Research 2023年第2期3卷 229-236页

作者： Yingcheng Li Tao Xin Chudan Qiu Keren Li Gangqin Liu Jun Li Yidun Wan Dawei Lu State Key Laboratory of Surface Physics Department of PhysicsCenter for Field Theory and Particle Physicsand Institute for Nanoelectronic devices and Quantum computingFudan UniversityShanghai 200433China Shanghai Qi Zhi Institute Shanghai 200030China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China d Guangdong Provincial Key Laboratory of Quantum Science and Engineering Shenzhen 518055GuangdongChina Center for Quantum Computing Peng Cheng LaboratoryShenzhen 518055China Institute of Physics Chinese Academy of SciencesBeijing 100190China

Among existing approaches to holonomic quantum computing,the adiabatic holonomic quantum gates(HQGs)suffer errors due to decoherence,while the non-adiabatic HQGs either require additional Hilbert spaces or are difficult to ***,we report a systematic,scalable approach based on dynamical invariants to realize HQGs without using additional Hilbert *** presenting the theoretical framework of our approach,we design and experimentally evaluate single-qubit and two-qubits HQGs for the nuclear magnetic resonance *** single-qubit gates acquire average fidelity 0.9972 by randomized benchmarking,and the controlled-NOT gate acquires fidelity 0.9782 by quantum process *** approach is also platform-independent,and thus may open a way to large-scale holonomic quantum computation.

关键词： Geometric gates Dynamical invariant Nuclear magnetic resonance Holonomic gates Platform-independent

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