Quantum Science and Technology最新文献_第7页

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

Almost device-independent calibration beyond Born’s rule: Bell tests for cross-talk detection 几乎与设备无关的校准超出了伯恩规则：贝尔测试串音检测

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-07 DOI: 10.1088/2058-9565/ade911

Gelo Noel M Tabia, Alex Yueh-Ting Shih, Jin-Yuan Zheng and Yeong-Cherng Liang

{"title":"Almost device-independent calibration beyond Born’s rule: Bell tests for cross-talk detection","authors":"Gelo Noel M Tabia, Alex Yueh-Ting Shih, Jin-Yuan Zheng and Yeong-Cherng Liang","doi":"10.1088/2058-9565/ade911","DOIUrl":"https://doi.org/10.1088/2058-9565/ade911","url":null,"abstract":"In quantum information, device-independent (DI) protocols offer a new approach to information processing tasks, making minimal assumptions about the devices used. Typically, since these protocols draw conclusions directly from the data collected in a meaningful Bell test, the no-signaling conditions, and often even Born’s rule for local measurements, are taken as premises of the protocol. Here, we demonstrate how to test such premises in an (almost) DI setting, i.e. directly from the raw data and with minimal assumptions. In particular, for IBM’s quantum computing cloud services, we implement the prediction-based ratio protocol to characterize how well the qubits can be accessed locally and independently. More precisely, by performing a variety of Clauser–Horne–Shimony–Holt-type experiments on these systems and carrying out rigorous hypothesis tests on the collected data, we provide compelling evidence showing that some of these qubits suffer from measurement cross-talks, i.e. their measurement statistics are affected by the choice of measurement bases on another qubit. Unlike standard randomized benchmarking, our approach does not rely on assumptions such as gate-independent Markovian noise. Moreover, despite the relatively small number of experimental trials, the direction of ‘signaling’ may also be identified in some cases. Our approach thus serves as a complementary tool for benchmarking the local addressability of quantum computing devices.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"181 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144578118","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

Large amplitude mechanical coherent states and detection of weak nonlinearities in cavity optomechanics 腔光力学中大振幅力学相干态及弱非线性检测

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-03 DOI: 10.1088/2058-9565/ade8a0

Wenlin Li, Paolo Piergentili, Francesco Marzioni, Michele Bonaldi, Antonio Borrielli, Enrico Serra, Francesco Marin, Francesco Marino, Nicola Malossi, Riccardo Natali, Giovanni Di Giuseppe and David Vitali

引用次数: 0

An experimental platform for levitated mechanics in space 太空悬浮力学实验平台

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-02 DOI: 10.1088/2058-9565/ade624

Jack Homans, Elliot Simcox, Jakub Wardak, Laura da Palma Barbara, Tim M Fuchs, Rafael Mufato, Florence Concepcion, Andrei Dragomir, Christian Vogt, Peter Nisbet-Jones, Christopher Bridges and Hendrik Ulbricht

{"title":"An experimental platform for levitated mechanics in space","authors":"Jack Homans, Elliot Simcox, Jakub Wardak, Laura da Palma Barbara, Tim M Fuchs, Rafael Mufato, Florence Concepcion, Andrei Dragomir, Christian Vogt, Peter Nisbet-Jones, Christopher Bridges and Hendrik Ulbricht","doi":"10.1088/2058-9565/ade624","DOIUrl":"https://doi.org/10.1088/2058-9565/ade624","url":null,"abstract":"Conducting experiments in extreme conditions has long been the aim of the levitated mechanics field, as it allows for the investigation of new fundamental physics phenomena. Sending these experiments into the micro-g environment of space has been one such milestone, with multiple proposals calling for such a platform. At the same time, levitated sensors have demonstrated a high sensitivity to external stimuli, such as electric, magnetic and gravitational forces, which will only improve in low-vibrational conditions. This paper describes the development of a technology demonstrator for optical and magnetic trapping experiments in space. Our payload represents the first concrete step towards future missions with aims of probing fundamental physical questions: matter-wave interferometry of nanoparticles to probe the limits of macroscopic quantum mechanics, detection of Dark Matter candidates and gravitational waves to test physics beyond the Standard Model, and accelerometry for Earth-observation.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"20 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547065","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

Quantum parallel information exchange (QPIE) hybrid network with transfer learning 具有迁移学习的量子并行信息交换（QPIE）混合网络

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-02 DOI: 10.1088/2058-9565/ade89f

Ziqing Guo, Alex Khan, Victor S Sheng, Shabnam Jabeen and Ziwen Pan

{"title":"Quantum parallel information exchange (QPIE) hybrid network with transfer learning","authors":"Ziqing Guo, Alex Khan, Victor S Sheng, Shabnam Jabeen and Ziwen Pan","doi":"10.1088/2058-9565/ade89f","DOIUrl":"https://doi.org/10.1088/2058-9565/ade89f","url":null,"abstract":"Quantum machine learning (QML) has emerged as an innovative framework that has the potential to uncover complex patterns by leveraging the ability of quantum systems to simulate and exploit high-dimensional latent spaces, particularly in learning tasks. Quantum neural network frameworks are inherently sensitive to the precision of gradient calculations and the computational limitations of current quantum hardware, as unitary rotations introduce overhead from complex number computations, and quantum gate operation speed remains a bottleneck for practical implementations. In this study, we introduce a quantum parallel information exchange hybrid network, a new non-sequential hybrid classical quantum model architecture that leverages quantum transfer learning by feeding pre-trained parameters from classical neural networks into quantum circuits. This enables efficient pattern recognition and temporal series data prediction by utilizing non-Clifford parameterized quantum gates, thereby enhancing both learning efficiency and representational capacity. Additionally, we developed a dynamic gradient selection method that applies the parameter-shift rule to quantum processing units (QPUs) and adjoint differentiation to graphics processing units (GPUs). Our results demonstrate that the model performance exhibits higher accuracy in ad-hoc benchmarks, lowering approximately 88% convergence rate for extra stochasticity time-series data within 100 -steps, and showing a more unbiased eigenvalue spectrum of the Fisher information matrix on the CPU/GPU and IonQ QPU simulators.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"35 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547483","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

From exponential to quadratic: optimal control for a frustrated Ising ring model 从指数到二次：受挫伊辛环模型的最优控制

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-01 DOI: 10.1088/2058-9565/ade6a5

Ruiyi Wang, Vincenzo Roberto Arezzo, Kiran Thengil, Giovanni Pecci and Giuseppe E Santoro

{"title":"From exponential to quadratic: optimal control for a frustrated Ising ring model","authors":"Ruiyi Wang, Vincenzo Roberto Arezzo, Kiran Thengil, Giovanni Pecci and Giuseppe E Santoro","doi":"10.1088/2058-9565/ade6a5","DOIUrl":"https://doi.org/10.1088/2058-9565/ade6a5","url":null,"abstract":"Exponentially small spectral gaps are known to be the crucial bottleneck for traditional Quantum Annealing (QA) based on interpolating between two Hamiltonians, a simple driving term and the complex problem to be solved, with a linear schedule in time. One of the simplest models exhibiting exponentially small spectral gaps is a ferromagnetic Ising ring with a single antiferromagnetic bond introducing frustration. Previous studies of this model have explored continuous-time diabatic QA, where optimized non-adiabatic annealing schedules provided good solutions, avoiding exponentially large annealing times. In our work, we move to a digital framework of Variational Quantum Algorithms, and present two main results: (1) we show that the model is digitally controllable with a scaling of resources that grows quadratically with the system size, achieving the exact solution using the Quantum Approximate Optimization Algorithm; (2) We combine a technique of quantum control—the Chopped RAndom Basis method—and digitized quantum annealing to construct smooth digital schedules yielding optimal solutions with very high accuracy.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"7 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144533272","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

Theoretical framework for quantum associative memories 量子联想记忆的理论框架

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-01 DOI: 10.1088/2058-9565/ade184

Adrià Labay-Mora, Eliana Fiorelli, Roberta Zambrini and Gian Luca Giorgi

{"title":"Theoretical framework for quantum associative memories","authors":"Adrià Labay-Mora, Eliana Fiorelli, Roberta Zambrini and Gian Luca Giorgi","doi":"10.1088/2058-9565/ade184","DOIUrl":"https://doi.org/10.1088/2058-9565/ade184","url":null,"abstract":"Associative memory (AM) refers to the ability to relate a memory with an input and targets the restoration of corrupted patterns. It has been intensively studied in classical physical systems, as in neural networks where an attractor dynamics settles on stable solutions. Several extensions to the quantum domain have been recently reported, displaying different features. In this work, we develop a comprehensive framework for a quantum AM (QAM) based on open quantum system dynamics, which allows us to compare existing models, identify the theoretical prerequisites for performing AM tasks, and extend it in different forms. The map that achieves an exponential increase in the number of stored patterns with respect to classical systems is derived. We establish the crucial role of symmetries and dissipation in the operation of QAM. Our theoretical analysis demonstrates the feasibility of addressing both quantum and classical patterns, orthogonal and non-orthogonal memories, stationary and metastable operating regimes, and measurement-based outputs. Finally, this opens up new avenues for practical applications in quantum computing and machine learning, such as quantum error correction or quantum memories.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"10 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144532959","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

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-07-01 DOI: 10.1088/2058-9565/ade7ad

Roberto Flórez-Ablan, Marco Roth and Jan Schnabel

{"title":"On the similarity of bandwidth-tuned quantum kernels and classical kernels","authors":"Roberto Flórez-Ablan, Marco Roth and Jan Schnabel","doi":"10.1088/2058-9565/ade7ad","DOIUrl":"https://doi.org/10.1088/2058-9565/ade7ad","url":null,"abstract":"Quantum kernels (QKs) are widely used in quantum machine learning applications; yet, their potential to surpass classical machine learning methods on classical datasets remains uncertain. This limitation can be attributed to the exponential concentration phenomenon, which can impair generalization. A common strategy to alleviate this is bandwidth tuning, which involves rescaling data points in the quantum model to improve generalization. In this work, we numerically demonstrate that optimal bandwidth tuning results in QKs that closely resemble radial basis function (RBF) kernels, leading to a lack of quantum advantage over classical methods. Moreover, we reveal that the size of optimal bandwidth tuning parameters further simplifies QKs, causing them to behave like polynomial kernels, corresponding to a low-order Taylor approximation of a RBF kernel. We thoroughly investigate this for fidelity quantum kernels and projected quantum kernels using various data encoding circuits across several classification datasets. We provide numerical evidence and derive a simple analytical model that elucidates how bandwidth tuning influences key quantities in classification tasks. Overall, our findings shed light on the mechanisms that render QK methods classically tractable.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"49 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144533271","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