Quantum Science and Technology最新文献_第2页

Bound entanglement-assisted prepare-and-measure scenarios based on four-dimensional quantum messages 基于四维量子信息的束缚纠缠辅助准备和测量方案

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-10-08 DOI: 10.1088/2058-9565/ae095f

István Márton, Erika Bene and Tamás Vértesi

引用次数: 0

Sample-based Hamiltonian and Lindbladian simulation: non-asymptotic analysis of sample complexity 基于样本的哈密顿和林德布拉模拟：样本复杂度的非渐近分析

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-10-08 DOI: 10.1088/2058-9565/ae075b

Byeongseon Go, Hyukjoon Kwon, Siheon Park, Dhrumil Patel and Mark M Wilde

{"title":"Sample-based Hamiltonian and Lindbladian simulation: non-asymptotic analysis of sample complexity","authors":"Byeongseon Go, Hyukjoon Kwon, Siheon Park, Dhrumil Patel and Mark M Wilde","doi":"10.1088/2058-9565/ae075b","DOIUrl":"https://doi.org/10.1088/2058-9565/ae075b","url":null,"abstract":"Density matrix exponentiation (DME) is a quantum algorithm that processes multiple copies of a program state σ to realize the Hamiltonian evolution . Wave matrix Lindbladization (WML) similarly processes multiple copies of a program state ψL in order to realize a Lindbladian evolution. Both algorithms are prototypical sample-based quantum algorithms and can be used for various quantum information processing tasks, including quantum principal component analysis, Hamiltonian simulation, and Lindbladian simulation. In this work, we present detailed sample complexity analyses for DME and sample-based Hamiltonian simulation, as well as for WML and sample-based Lindbladian simulation. In particular, we prove that the sample complexity of DME is no larger than , where t is the desired evolution time and ɛ is the desired imprecision level, as quantified by the normalized diamond distance. We also establish a fundamental lower bound on the sample complexity of sample-based Hamiltonian simulation, which matches our DME sample complexity bound up to a constant multiplicative factor, thereby proving that DME is optimal for sample-based Hamiltonian simulation. Additionally, we prove that the sample complexity of WML is no larger than , where d is the dimension of the space on which the Lindblad operator acts nontrivially, and we prove a lower bound of on the sample complexity of sample-based Lindbladian simulation. These results prove that WML is optimal for sample-based Lindbladian simulation whenever the Lindblad operator acts nontrivially on a constant-sized system. Finally, we point out that the DME sample complexity analysis in Kimmel et al(2017 npj Quantum Inf.3 13) and the WML sample complexity analysis in Patel and Wilde (2023 Open Syst. Inf. Dyn.30 2350010) appear to be incomplete, highlighting the need for the results presented here.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"9 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145246828","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

Gradient-descent methods for fast quantum state tomography 快速量子态层析成像的梯度下降方法

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-10-07 DOI: 10.1088/2058-9565/ae0baa

Akshay Gaikwad, Manuel Sebastian Torres, Shahnawaz Ahmed and Anton Frisk Kockum

{"title":"Gradient-descent methods for fast quantum state tomography","authors":"Akshay Gaikwad, Manuel Sebastian Torres, Shahnawaz Ahmed and Anton Frisk Kockum","doi":"10.1088/2058-9565/ae0baa","DOIUrl":"https://doi.org/10.1088/2058-9565/ae0baa","url":null,"abstract":"Quantum state tomography (QST) is a widely employed technique for characterizing the state of a quantum system. However, it is plagued by two fundamental challenges: computational and experimental complexity grows exponentially with the number of qubits, rendering experimental implementation and data post-processing arduous even for moderately sized systems. Here, we introduce gradient-descent (GD) algorithms for the post-processing step of QST in discrete- and continuous-variable systems. To ensure physically valid state reconstruction at each iteration step of the algorithm, we use various density-matrix parameterizations: Cholesky decomposition, Stiefel manifold, and projective normalization. These parameterizations have the added benefit of enabling a rank-controlled ansatz, which simplifies reconstruction when there is prior information about the system. We benchmark the performance of our GD-QST techniques against state-of-the-art methods, including constrained convex optimization, conditional generative adversarial networks, and iterative maximum likelihood estimation. Our comparison focuses on time complexity, iteration counts, data requirements, state rank, and robustness against noise. We find that rank-controlled ansatzes in our stochastic mini-batch GD-QST algorithms effectively handle noisy and incomplete data sets, yielding significantly higher reconstruction fidelity than other methods. Simulations achieving full-rank seven-qubit QST in under three minutes on a standard laptop, with 18 GB of RAM and no dedicated GPU, highlight that GD-QST is computationally more efficient and outperforms other techniques in most scenarios, offering a promising avenue for characterizing noisy intermediate-scale quantum devices. Our Python code for GD-QST algorithms is publicly available at github.com/mstorresh/GD-QST.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"18 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145241151","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

Digital quantum simulation of cavity quantum electrodynamics: insights from superconducting and trapped ion quantum testbeds 腔量子电动力学的数字量子模拟：来自超导和捕获离子量子试验台的见解

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-10-07 DOI: 10.1088/2058-9565/ae0af0

Alex H Rubin, Brian Marinelli, Victoria A Norman, Zainab Rizvi, Ashlyn D Burch, Ravi K Naik, John Mark Kreikebaum, Matthew N H Chow, Daniel S Lobser, Melissa C Revelle, Christopher G Yale, Megan Ivory, David I Santiago, Christopher Spitzer, Marina Marinkovic, Susan M Clark, Irfan Siddiqi and Marina Radulaski

{"title":"Digital quantum simulation of cavity quantum electrodynamics: insights from superconducting and trapped ion quantum testbeds","authors":"Alex H Rubin, Brian Marinelli, Victoria A Norman, Zainab Rizvi, Ashlyn D Burch, Ravi K Naik, John Mark Kreikebaum, Matthew N H Chow, Daniel S Lobser, Melissa C Revelle, Christopher G Yale, Megan Ivory, David I Santiago, Christopher Spitzer, Marina Marinkovic, Susan M Clark, Irfan Siddiqi and Marina Radulaski","doi":"10.1088/2058-9565/ae0af0","DOIUrl":"https://doi.org/10.1088/2058-9565/ae0af0","url":null,"abstract":"We explore the potential for hybrid development of quantum hardware where currently available quantum computers simulate open cavity quantum electrodynamical (CQED) systems for applications in optical quantum communication, simulation and computing. Our simulations make use of a recent quantum algorithm that maps the dynamics of a singly excited open Tavis–Cummings model containing N atoms coupled to a lossy cavity. We report the results of executing this algorithm on two noisy intermediate-scale quantum computers: a superconducting processor and a trapped ion processor, to simulate the population dynamics of an open CQED system featuring N = 3 atoms. By applying technology-specific transpilation and error mitigation techniques, we minimize the impact of gate errors, noise, and decoherence in each hardware platform, obtaining results which agree closely with the exact solution of the system. These results can be used as a recipe for efficient and platform-specific quantum simulation of cavity–emitter systems on contemporary and future quantum computers.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"59 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145241150","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

Continuous variable structured collision models 连续变结构碰撞模型

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-10-07 DOI: 10.1088/2058-9565/ae0a7b

Anton Corr, Stefano Cusumano and Gabriele De Chiara

引用次数: 0

On the role of symmetry and geometry in global quantum sensing 论对称和几何在全局量子传感中的作用

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-10-06 DOI: 10.1088/2058-9565/ae08e1

Julia Boeyens, Jonas Glatthard, Edward Gandar, Stefan Nimmrichter, Luis A Correa and Jesús Rubio

{"title":"On the role of symmetry and geometry in global quantum sensing","authors":"Julia Boeyens, Jonas Glatthard, Edward Gandar, Stefan Nimmrichter, Luis A Correa and Jesús Rubio","doi":"10.1088/2058-9565/ae08e1","DOIUrl":"https://doi.org/10.1088/2058-9565/ae08e1","url":null,"abstract":"Global quantum sensing enables parameter estimation across arbitrary ranges with a finite number of measurements. Among the various existing formulations, the Bayesian paradigm stands as a flexible approach for optimal protocol design under minimal assumptions. Within this paradigm, however, there are two fundamentally different ways to capture prior ignorance and uninformed estimation; namely, requiring invariance of the prior distribution under specific parameter transformations, or adhering to the geometry of a state space. In this paper we carefully examine the practical consequences of both the invariance-based and the geometry-based approaches, and show how to apply them in relevant examples of rate and coherence estimation in noisy settings. We find that, while the invariance-based approach often leads to simpler priors and estimators and is more broadly applicable in adaptive scenarios, the geometry-based one can lead to faster posterior convergence in a well-defined measurement setting. Crucially, by employing the notion of location-isomorphic parameters, we are able to unify the two formulations into a single practical and versatile framework for optimal global quantum sensing, detailing when and how each set of assumptions should be employed to tackle any given estimation task. We thus provide a blueprint for the design of novel high-precision quantum sensors.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"123 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235047","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

Adiabatic dynamics of entanglement 纠缠的绝热动力学

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-10-06 DOI: 10.1088/2058-9565/ae0364

Einar Gabbassov and Achim Kempf

引用次数: 0

A simple quantum simulation algorithm with near-optimal precision scaling 一个简单的量子模拟算法，具有接近最优的精度缩放

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-09-29 DOI: 10.1088/2058-9565/ae075a

Amir Kalev and Itay Hen

引用次数: 0

Molecular docking via weighted subgraph isomorphism on quantum annealers 量子退火上基于加权子图同构的分子对接

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-09-29 DOI: 10.1088/2058-9565/ae0890

Emanuele Triuzzi, Riccardo Mengoni, Francesco Micucci, Domenico Bonanni, Daniele Ottaviani, Andrea Rosario Beccari and Gianluca Palermo

引用次数: 0

Universal dissipators for driven open quantum systems and the correction to linear response 驱动开放量子系统的通用耗散及对线性响应的修正

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-09-29 DOI: 10.1088/2058-9565/ae0827

Lorenzo Bernazzani, Balázs Gulácsi and Guido Burkard

{"title":"Universal dissipators for driven open quantum systems and the correction to linear response","authors":"Lorenzo Bernazzani, Balázs Gulácsi and Guido Burkard","doi":"10.1088/2058-9565/ae0827","DOIUrl":"https://doi.org/10.1088/2058-9565/ae0827","url":null,"abstract":"We investigate in parallel two common pictures used to describe quantum systems interacting with their surrounding environment, i.e. the stochastic Hamiltonian description, where the environment is implicitly included in the fluctuating internal parameters of the system, and the explicit inclusion of the environment via the time-convolutionless projection operator method. Utilizing these two different frameworks, we show that the dissipator characterizing the dynamics of the reduced system, determined up to second order in the noise strength or bath-system coupling, is composed of two parts. One is universal, meaning that it keeps the same form regardless of the drive term. This form constitutes the relevant part of the dissipator only as long as the drive is weak. We thoroughly discuss the assumptions on which this treatment is based and its limitations. Then, by considering the first non-vanishing higher-order term in our expansion, we derive the other, drive-dependent, term completing the full dissipator. This part of the dissipator, originating from the third cumulant, is usually neglected when modeling the decoherent dynamics of controlled qubits. However, this further term constitutes the linear response correction due to memory-mediated environmental effects in driven-dissipative quantum systems. Also, it notably shows that the structure of our quantum master equation goes beyond the Lindblad form. The Lindblad form is recovered for memory-less baths. Finally, we demonstrate this technique to be highly accurate for the problems of dephasing in a driven qubit and for the theory of pseudo-modes for quantum environments.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"105 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145188513","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