Quantum Science and Technology最新文献

Decoherence time of the ground state spin of V ... V的基态自旋的退相干时间…

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-21 DOI: 10.1088/2058-9565/adeeb8

F T Tabesh, S Rahimi-Keshari and M Abdi

引用次数: 0

Identifying contributions of classical and quantum correlations to entropy production in non-equilibrium quantum processes 确定非平衡量子过程中经典和量子相关对熵产生的贡献

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-21 DOI: 10.1088/2058-9565/adee41

Xu-Cai Zhuang, Qing-Feng Xue, Qi Zhang, Rui Huang, Yun-Jie Xia and Zhong-Xiao Man

{"title":"Identifying contributions of classical and quantum correlations to entropy production in non-equilibrium quantum processes","authors":"Xu-Cai Zhuang, Qing-Feng Xue, Qi Zhang, Rui Huang, Yun-Jie Xia and Zhong-Xiao Man","doi":"10.1088/2058-9565/adee41","DOIUrl":"https://doi.org/10.1088/2058-9565/adee41","url":null,"abstract":"Entropy production plays a pivotal role in characterizing the inherent irreversibility of non-equilibrium quantum processes, and a thorough understanding of this concept holds immense potential for advancing the design of thermodynamically efficient quantum technologies. In this work, we demonstrate that the entropy production observed in multipartite open quantum systems, undergoing independent dissipations, arises from two sources: the local dynamics governing individual subsystems and the non-local correlations embedded within the system. The contributions of quantum correlations, as genuine quantum effects, to entropy production are identified explicitly. The revelation of the source of entropy production is substantiated by an analysis of its stochastic counterpart, derived from quantum trajectories. Furthermore, we propose an experimentally feasible scheme to isolate the contributions of both classical and quantum correlations to entropy production. The theoretical findings are simulated using an optical setup. Our work establishes a profound connection between thermodynamic and informational quantities, elucidating the source of irreversibility in the non-equilibrium process of multipartite quantum systems and the genuine quantum contribution therein.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"99 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144677387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Non-positive energy quasidistributions in coherent collision models 相干碰撞模型中的非正能量准分布

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-21 DOI: 10.1088/2058-9565/aded2e

Marco Pezzutto, Gabriele De Chiara and Stefano Gherardini

引用次数: 0

Adaptive-depth randomized measurement for fermionic observables 费米子观测值的自适应深度随机测量

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-20 DOI: 10.1088/2058-9565/adeeb9

Kaiming Bian and Bujiao Wu

{"title":"Adaptive-depth randomized measurement for fermionic observables","authors":"Kaiming Bian and Bujiao Wu","doi":"10.1088/2058-9565/adeeb9","DOIUrl":"https://doi.org/10.1088/2058-9565/adeeb9","url":null,"abstract":"Accurate estimation of fermionic observables is essential for advancing quantum physics and chemistry. The fermionic classical shadow (FCS) method offers an efficient framework for estimating these observables without requiring a transformation into a Pauli basis for k-local Fermionic observables. However, the random matchgate circuits in FCS require linear-depth circuits with a brickwork structure, which presents significant challenges for near-term quantum devices with limited computational resources. To address this limitation, we introduce an adaptive-depth fermionic classical shadow (ADFCS) protocol designed to reduce the circuit depth while maintaining the sample complexity. Through theoretical analysis and numerical fitting, we establish that the required depth for approximating a fermionic observable H is upper bounded by when the locality k is a constant, where dint is the interaction distance of H and n is the number of qubits. We demonstrate the effectiveness of the ADFCS protocol through numerical experiments, which show similar accuracy to the traditional FCS method while requiring significantly fewer quantum resources. Additionally, we apply ADFCS to compute the expectation value of the Kitaev chain Hamiltonian, further validating its performance in practical scenarios. Our findings suggest that ADFCS enables more efficient quantum simulations when the locality k is constant, reducing circuit depth while preserving the sample complexity and offering a viable solution for near-term quantum devices.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"12 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144669723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An accurate and efficient analytic model of fidelity under depolarizing noise oriented to large scale quantum system design 面向大尺度量子系统设计的去极化噪声下保真度精确高效分析模型

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-16 DOI: 10.1088/2058-9565/aded2f

Pau Escofet, Santiago Rodrigo, Artur Garcia-Sáez, Eduard Alarcón, Sergi Abadal and Carmen G Almudéver

{"title":"An accurate and efficient analytic model of fidelity under depolarizing noise oriented to large scale quantum system design","authors":"Pau Escofet, Santiago Rodrigo, Artur Garcia-Sáez, Eduard Alarcón, Sergi Abadal and Carmen G Almudéver","doi":"10.1088/2058-9565/aded2f","DOIUrl":"https://doi.org/10.1088/2058-9565/aded2f","url":null,"abstract":"Fidelity is one of the most valuable and commonly used metrics for assessing the performance of quantum circuits on error-prone quantum processors. Several approaches have been proposed to estimate circuit fidelity without executing it on quantum hardware, but they often face limitations in scalability or accuracy. In this work, we present a comprehensive theoretical framework to predict the fidelity of quantum circuits under depolarizing noise. Building on theoretical results, we propose an efficient fidelity estimation algorithm based on device calibration data. The method is thoroughly validated through simulation and execution on real hardware, demonstrating improved accuracy compared to state-of-the-art alternatives, with enhancements in prediction R2 ranging from 4.96% to 213.54%. The proposed approach provides a scalable and practical tool for benchmarking quantum hardware, comparing quantum software techniques such as compilation methods, obtaining computation bounds for quantum systems, and guiding hardware design decisions, making it a critical resource for developing and evaluating quantum computing technologies.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"16 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144645627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental validation of boson sampling using detector binning 用探测器分束法进行玻色子采样的实验验证

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-16 DOI: 10.1088/2058-9565/adecbc

Malaquias Correa Anguita, Anita Camillini, Sara Marzban, Marco Robbio, Benoit Seron, Leonardo Novo and Jelmer J Renema

{"title":"Experimental validation of boson sampling using detector binning","authors":"Malaquias Correa Anguita, Anita Camillini, Sara Marzban, Marco Robbio, Benoit Seron, Leonardo Novo and Jelmer J Renema","doi":"10.1088/2058-9565/adecbc","DOIUrl":"https://doi.org/10.1088/2058-9565/adecbc","url":null,"abstract":"We experimentally demonstrate a testing strategy for boson samplers that is based on efficiently computable expressions for the output photon counting distributions binned over multiple optical modes. We apply this method to validate boson sampling experiments with three photons on a reconfigurable photonic chip, which implements a four-mode interferometer, analyzing 50 Haar-random unitary transformations while tuning photon indistinguishability via controlled delays. We show that for (nearly) indistinguishable photons, the experiment accurately reproduces the ideal boson sampling binned-mode distributions, which exhibit variations that depend both on the specific interferometer implemented as well as the choice of bin, confirming the usefulness of the method to diagnose imperfections such as partial distinguishability or imperfect chip control. Finally, we analyze the behavior of Haar-averaged binned-mode distributions in relation to indistinguishability and demonstrate analytically that its variance is proportional to the average of the square of the photons’ indistinguishability parameter. These findings highlight the central role of binning in boson sampling validation, offering a scalable and efficient framework for assessing multiphoton interference and experimental performance.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"95 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144645597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Detrimental non-Markovian errors for surface code memory 表面代码存储器的有害非马尔可夫错误

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-15 DOI: 10.1088/2058-9565/adebab

John F Kam, Spiro Gicev, Kavan Modi, Angus Southwell and Muhammad Usman

引用次数: 0

Combining kinetic and thermodynamic uncertainty relations in quantum transport 结合量子输运中的动力学和热力学不确定性关系

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-14 DOI: 10.1088/2058-9565/ade623

Didrik Palmqvist, Ludovico Tesser and Janine Splettstoesser

{"title":"Combining kinetic and thermodynamic uncertainty relations in quantum transport","authors":"Didrik Palmqvist, Ludovico Tesser and Janine Splettstoesser","doi":"10.1088/2058-9565/ade623","DOIUrl":"https://doi.org/10.1088/2058-9565/ade623","url":null,"abstract":"We study the fluctuations of generic currents in multi-terminal, multi-channel coherent quantum transport settings. In the quantum regime, these fluctuations and the resulting precision differ strongly depending on whether the device is of fermionic or bosonic nature. Using scattering theory, we show that the precision is bounded by constraints set by the entropy production and by the activity in the spirit of thermodynamic or kinetic uncertainty relations, valid for fermionic and bosonic quantum systems also in the absence of time-reversal symmetry. Furthermore, we derive a combined thermodynamic kinetic uncertainty relation, which is tight over a wide range of parameters and can hence predict the reachable precision of a device. Since these constraints can be expressed in terms of observables accessible in transport measurements, such as currents and bandwidth, we foresee that the tight thermodynamic kinetic uncertainty-like bounds are also useful as an inference tool: they can be exploited to estimate entropy production from transport observables, such as the charge current and its noise, which are more easily accessible in experiment.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"66 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144630328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Storage of single photons from a semiconductor quantum dot in a room-temperature atomic vapor memory with on-demand retrieval 半导体量子点单光子在室温原子蒸气存储器中随需检索的存储

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-13 DOI: 10.1088/2058-9565/ade910

Benjamin Maaß, Avijit Barua, Norman Vincenz Ewald, Elizabeth Robertson, Kartik Gaur, Suk In Park, Sven Rodt, Jin-Dong Song, Stephan Reitzenstein and Janik Wolters

{"title":"Storage of single photons from a semiconductor quantum dot in a room-temperature atomic vapor memory with on-demand retrieval","authors":"Benjamin Maaß, Avijit Barua, Norman Vincenz Ewald, Elizabeth Robertson, Kartik Gaur, Suk In Park, Sven Rodt, Jin-Dong Song, Stephan Reitzenstein and Janik Wolters","doi":"10.1088/2058-9565/ade910","DOIUrl":"https://doi.org/10.1088/2058-9565/ade910","url":null,"abstract":"Interfacing light from solid-state single-photon sources with scalable and robust room-temperature quantum memories has been a long-standing challenge in photonic quantum information technologies due to inherent noise processes and time-scale mismatches between the operating conditions of solid-state and atomic systems. Here, we demonstrate storage of single photons from a semiconductor quantum dot (QD) device in a room-temperature atomic vapor memory and their on-demand retrieval. A deterministically fabricated InGaAs QD light source emits single photons at the wavelength of the cesium D1 line at 895 nm which exhibit an inhomogeneously broadened linewidth of 5.1(7) GHz and are subsequently stored in a low-noise ladder-type cesium vapor memory. We show control over the interaction between the single photons and the atomic vapor, allowing for variable retrieval times of up to 19.8(3) ns. A maximum internal efficiency of is achieved. Our results expand the application space of both room-temperature vapor memories and semiconductor QDs in future quantum network architectures.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"668 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Applications of the CCZS gate in quantum circuit synthesis CCZS门在量子电路合成中的应用

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-13 DOI: 10.1088/2058-9565/adebac

Fudong Liu, Tailyu Fan, Guoqiang Shu, Chunyan Zhang, Weilong Wang, Xuyan Qi, Xinxin Zhu, Hongru Yang and Yangyang Fei

{"title":"Applications of the CCZS gate in quantum circuit synthesis","authors":"Fudong Liu, Tailyu Fan, Guoqiang Shu, Chunyan Zhang, Weilong Wang, Xuyan Qi, Xinxin Zhu, Hongru Yang and Yangyang Fei","doi":"10.1088/2058-9565/adebac","DOIUrl":"https://doi.org/10.1088/2058-9565/adebac","url":null,"abstract":"Limited by the decoherence of qubits as well as the errors of quantum gates, near-term superconducting quantum computers can only run low-depth quantum circuits to achieve acceptable fidelity. One possible way to overcome these limitations is to construct quantum circuits with additional high-fidelity expressive multi-qubit gates. Recently, a new three-qubit gate, denoted as Controlled-CPHASE-SWAP (CCZS), has been implemented through simultaneous Controlled-Z (CZ) gates. The CCZS gate takes less time than a single CZ gate and can be implemented at the coherence limit. However, how to use the CCZS gate in quantum circuit synthesis remains unexplored. In this paper, we construct the quantum fan-out/parity gates, the controlled-phase gate and the locally fully connected CZ gates with the CCZS gate, respectively. Furthermore, applications of the CCZS gate in quantum error correction, quantum Fourier transform and quantum approximate optimization algorithm are also proposed. We evaluate the performance of the CCZS gate in quantum circuit synthesis through simulation and explore its potential advantages over CZ gates.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"51 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0