Quantum Science and Technology最新文献_第3页

Spatial and pulse efficiency constraints in atom interferometric gravitational wave detectors 原子干涉引力波探测器的空间和脉冲效率约束

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-09-09 DOI: 10.1088/2058-9565/adffb1

P Schach and E Giese

{"title":"Spatial and pulse efficiency constraints in atom interferometric gravitational wave detectors","authors":"P Schach and E Giese","doi":"10.1088/2058-9565/adffb1","DOIUrl":"https://doi.org/10.1088/2058-9565/adffb1","url":null,"abstract":"Currently planned and constructed terrestrial detectors for gravitational waves and dark matter based on differential light-pulse atom interferometry are designed around three primary strategies to enhance their sensitivity: (i) Resonant-mode enhancement using multiple diamonds, (ii) large-momentum-transfer (LMT) techniques to increase arm separation within the interferometer, and (iii) very-long baseline schemes that increase the distance between the two interferometers. Both resonant-mode enhancement and LMT techniques result in a greater number of light pulses, making high pulse fidelity during atom-light interactions imperative. At the same time, increasing the number of diamonds in vertical configurations leads to taller atomic fountains, which consequently reduces the available distance between interferometers. As a result, the number of diamonds, LMT pulses, and the fountain height are interdependent parameters that must be carefully balanced. In this work, we present optimal configurations for multi-diamond geometries in resonant mode, explicitly accounting for the spatial extent of a single interferometer, considering constraints imposed by the baseline dimensions and atomic losses due to imperfect pulses. For this optimization, we numerically scan the relevant parameters such as initial position and momentum of the atomic cloud, transferred momenta, and number of loops. For each parameter set, we verify whether the imposed conditions are met and evaluate the resulting sensitivities to identify optimal configurations. We provide practical analytical relations to estimate the optimal number of pulses that should be applied. Many proposals beyond demonstrator experiments require pulse numbers that demand efficiencies not yet demonstrated with state-of-the-art momentum transfer techniques. As a result, the observed sensitivity falls short of expectations—an effect caused by both arm separation and atom loss per pulse—highlighting the urgent need for research aimed at improving pulse fidelities.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"24 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145025563","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

Benchmarking a wide range of optimisers for solving the Fermi–Hubbard model using the variational quantum eigensolver 使用变分量子特征解算器对求解费米-哈伯德模型的广泛优化器进行基准测试

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-09-09 DOI: 10.1088/2058-9565/adfe15

Benjamin D M Jones, Lana Mineh and Ashley Montanaro

{"title":"Benchmarking a wide range of optimisers for solving the Fermi–Hubbard model using the variational quantum eigensolver","authors":"Benjamin D M Jones, Lana Mineh and Ashley Montanaro","doi":"10.1088/2058-9565/adfe15","DOIUrl":"https://doi.org/10.1088/2058-9565/adfe15","url":null,"abstract":"We numerically benchmark 30 optimisers on 372 instances of the variational quantum eigensolver for solving the Fermi–Hubbard system with the Hamiltonian variational ansatz. We rank the optimisers with respect to metrics such as final energy achieved and function calls needed to get within a certain tolerance level, and find that the best-performing optimisers are variants of gradient descent such as Momentum and ADAM (using finite difference), SPSA, CMAES, and BayesMGD. We perform gradient analysis, and observe that the step size for finite difference has a very significant impact. We also consider using simultaneous perturbation (inspired by SPSA) as a gradient subroutine: here finite difference can lead to a more precise estimate of the ground state but uses more calls, whereas simultaneous perturbation can converge quicker but may be less precise in the later stages. Finally, we study the quantum natural gradient algorithm: we implement this method for one-dimensional Fermi–Hubbard systems, and find that whilst it can reach a lower energy with fewer iterations, this improvement is typically lost when taking total function calls into account. Our method involves performing careful hyperparameter sweeping on 4 instances. We present a variety of analysis and figures, detailed optimiser notes, and discuss future directions.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"53 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145025559","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

Validation tests of Gaussian boson samplers with photon-number resolving detectors 光子数分辨探测器高斯玻色子取样器的验证试验

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-09-08 DOI: 10.1088/2058-9565/adfe16

Alexander S Dellios, Margaret D Reid and Peter D Drummond

{"title":"Validation tests of Gaussian boson samplers with photon-number resolving detectors","authors":"Alexander S Dellios, Margaret D Reid and Peter D Drummond","doi":"10.1088/2058-9565/adfe16","DOIUrl":"https://doi.org/10.1088/2058-9565/adfe16","url":null,"abstract":"An important challenge with the current generation of noisy, large-scale quantum computers is the question of validation. Does the hardware generate correct answers? If not, what are the errors? This issue is often combined with questions of computational advantage, but it is a fundamentally distinct issue. In current experiments, complete validation of the output statistics is generally not possible because it is exponentially hard to do so. Here, we apply phase-space simulation methods to partially verify recent experiments on Gaussian boson sampling (GBS) implementing photon-number resolving detectors. The positive-P phase-space distribution is employed, as it uses probabilistic sampling to reduce complexity. It is times faster than direct classical simulation for experiments on 288 modes where quantum computational advantage is claimed. When combined with binning and marginalization to improve statistics, multiple validation tests are efficiently computable, of which some tests can be carried out on experimental data. We show that the data as a whole has discrepancies with theoretical predictions for perfect squeezing. However, a modification of the GBS parameters greatly improves agreement for some tests. We suggest that such validation tests could form the basis of feedback methods to improve GBS experiments.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"52 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145017658","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

QSSS-LTE: quantum secret sharing scheme over lattice-based threshold encryption QSSS-LTE：基于格子阈值加密的量子秘密共享方案

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-09-07 DOI: 10.1088/2058-9565/adff2f

Xiuli Song, Tianai Xu, Yousheng Zhou and Tao Wu

{"title":"QSSS-LTE: quantum secret sharing scheme over lattice-based threshold encryption","authors":"Xiuli Song, Tianai Xu, Yousheng Zhou and Tao Wu","doi":"10.1088/2058-9565/adff2f","DOIUrl":"https://doi.org/10.1088/2058-9565/adff2f","url":null,"abstract":"This paper proposed a quantum secret sharing scheme over lattice-based threshold encryption: it integrates resplittable threshold public key encryption (RTPKE) and utilizes a lattice-based private key share transmission mechanism to enhance the security of the share distribution process. By leveraging the dynamic key management features of RTPKE, the scheme can flexibly adjust key distribution as required when participants change. During the quantum secret reconstruction process, the decoy particles do not need to be detected by eavesdroppers when transmitted between participants. Instead, this task is performed by a semi-trusted third party (TP), reducing resource consumption and communication overhead. The decoy particles are not chosen from a fixed quantum bases but are instead in completely random quantum bases, making it impossible for an eavesdropper to obtain the correct result through conventional measurements. The probability of the eavesdropper escaping detection after measuring any decoy particle is nearly zero. After each participant performs a unitary operation, they randomly shuffle the sequence of decoy and information particles. When the particles are transmitted back to the TP, the TP uses the sequence information recorded by the participants to restore the original order and extract the information particles, effectively defending against forgery-replay attacks and potential threats from dishonest participants.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"31 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145008960","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

Enhancing the Ramsey contrast of an NV-ensemble in diamond using quantum optimal control 利用量子最优控制增强金刚石中nv系综的Ramsey对比度

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-09-04 DOI: 10.1088/2058-9565/adffb2

Isabell Jauch, Artur Skljarow, Thomas Strohm, Florian Dolde, Tino Fuchs and Fedor Jelezko

引用次数: 0

A nonstabilizerness monotone from stabilizerness asymmetry 由稳定性不对称得到的非稳定性单调

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-08-31 DOI: 10.1088/2058-9565/adfd0d

Poetri Sonya Tarabunga, Martina Frau, Tobias Haug, Emanuele Tirrito and Lorenzo Piroli

{"title":"A nonstabilizerness monotone from stabilizerness asymmetry","authors":"Poetri Sonya Tarabunga, Martina Frau, Tobias Haug, Emanuele Tirrito and Lorenzo Piroli","doi":"10.1088/2058-9565/adfd0d","DOIUrl":"https://doi.org/10.1088/2058-9565/adfd0d","url":null,"abstract":"We introduce a nonstabilizerness monotone which we name basis-minimized stabilizerness asymmetry (BMSA). It is based on the notion of G-asymmetry, a measure of how much a certain state deviates from being symmetric with respect to a symmetry group G. For pure states, we show that the BMSA is a strong monotone for magic-state resource theory, while it can be extended to mixed states via the convex roof construction. We discuss its relation with other magic monotones, first showing that the BMSA coincides with the recently introduced basis-minimized measurement entropy, thereby establishing the strong monotonicity of the latter. Next, we provide inequalities between the BMSA and other nonstabilizerness measures such as the robustness of magic, stabilizer extent, stabilizer rank, stabilizer fidelity and stabilizer Rényi entropy. We also prove that the stabilizer fidelity, stabilizer Rényi entropy and BMSA with index have the same asymptotic scaling with qubit number. Finally, we present numerical methods to compute the BMSA, highlighting its advantages and drawbacks compared to other nonstabilizerness measures in the context of pure many-body quantum states. We also discuss the importance of additivity and strong monotonicity for measures of nonstabilizerness in many-body physics, motivating the search for additional computable nonstabilizerness monotones.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"35 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924090","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 ergodicity and scrambling in quantum annealers 量子退火炉中的量子遍历性和置乱

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-08-31 DOI: 10.1088/2058-9565/adfc08

Manuel H Muñoz-Arias and Pablo M Poggi

引用次数: 0

Variational quantum algorithm for constrained topology optimization 约束拓扑优化的变分量子算法

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-08-28 DOI: 10.1088/2058-9565/adfc92

Jungin E Kim and Yan Wang

引用次数: 0

Disentangling quantum autoencoder 解纠缠量子自编码器

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-08-26 DOI: 10.1088/2058-9565/adfc07

Adithya Sireesh, Abdulla Alhajri, M S Kim and Tobias Haug

引用次数: 0

Quantum generative classification with mixed states 混合态量子生成分类

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-08-26 DOI: 10.1088/2058-9565/adf350

Diego H Useche, Sergio Quiroga-Sandoval, Sebastian L Molina, Vladimir Vargas-Calderón, Juan E Ardila-García and Fabio A González

{"title":"Quantum generative classification with mixed states","authors":"Diego H Useche, Sergio Quiroga-Sandoval, Sebastian L Molina, Vladimir Vargas-Calderón, Juan E Ardila-García and Fabio A González","doi":"10.1088/2058-9565/adf350","DOIUrl":"https://doi.org/10.1088/2058-9565/adf350","url":null,"abstract":"Classification can be performed using either a discriminative or a generative learning approach. Discriminative learning consists of constructing the conditional probability of the outputs given the inputs, while generative learning consists of constructing the joint probability density of the inputs and outputs. Although most classical and quantum methods are discriminative, there are some advantages of the generative learning approach. For instance, it can be applied to unsupervised learning, statistical inference, uncertainty estimation, and synthetic data generation. In this article, we present a quantum generative multiclass classification strategy, called quantum generative classification (QGC). This model uses a variational quantum algorithm to estimate the joint probability density function of features and labels of a data set by means of a mixed quantum state. We also introduce a quantum map called quantum-enhanced Fourier features, which leverages quantum superposition to prepare high-dimensional data samples in quantum hardware using a small number of qubits. We show that the QGC algorithm can be viewed as a Gaussian mixture that reproduces a kernel Hilbert space of the training data. In addition, we developed a hybrid quantum–classical neural network that shows that it is possible to perform generative classification on high-dimensional data sets. The method was tested on various low- and high-dimensional data sets including the 10-class MNIST and Fashion-MNIST data sets, illustrating that the generative classification strategy is competitive against other previous quantum models.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"56 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905992","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