Quantum Science and Technology最新文献_第8页

Steady-state coherence in multipartite quantum systems: its connection with thermodynamic quantities and impact on quantum thermal machines 多部量子系统的稳态相干性：与热力学量的联系及其对量子热机的影响

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-04-16 DOI: 10.1088/2058-9565/adcae5

Rui Huang, Qing-Yu Cai, Farzam Nosrati, Rosario Lo Franco and Zhong-Xiao Man

{"title":"Steady-state coherence in multipartite quantum systems: its connection with thermodynamic quantities and impact on quantum thermal machines","authors":"Rui Huang, Qing-Yu Cai, Farzam Nosrati, Rosario Lo Franco and Zhong-Xiao Man","doi":"10.1088/2058-9565/adcae5","DOIUrl":"https://doi.org/10.1088/2058-9565/adcae5","url":null,"abstract":"Understanding how coherence of quantum systems affects thermodynamic quantities, such as work and heat, is essential for harnessing quantumness effectively in thermal quantum technologies. Here, we study the unique contributions of quantum coherence among different subsystems of a multipartite system, specifically in non-equilibrium steady states, to work and heat currents. Our system comprises two coupled ensembles, each consisting of N particles, interacting with two baths of different temperatures, respectively. The particles in an ensemble interact with their bath either simultaneously or sequentially, leading to non-local dissipation and enabling the decomposition of work and heat currents into local and non-local components. We find that the non-local heat current, as well as both the local and non-local work currents, are linked to the system quantum coherence. We provide explicit expressions of coherence-related quantities that determine the work currents under various intrasystem interactions. Our scheme is versatile, capable of functioning as a refrigerator, an engine, and an accelerator, with its performance being highly sensitive to the configuration settings. These findings establish a connection between thermodynamic quantities and quantum coherence, supplying valuable insights for the design of quantum thermal machines.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"6 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841267","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-Markovian quantum heat statistics with the reaction coordinate mapping 具有反应坐标映射的非马尔可夫量子热统计

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-04-15 DOI: 10.1088/2058-9565/adc6b7

Mike Shubrook, Jake Iles-Smith and Ahsan Nazir

引用次数: 0

Benchmarking the performance of a high-Q cavity qudit using random unitaries 使用随机单位对高q腔qudit的性能进行基准测试

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-04-13 DOI: 10.1088/2058-9565/adc47c

Nicholas Bornman, Tanay Roy, Joshua A Job, Namit Anand, Gabriel N Perdue, Silvia Zorzetti and M Sohaib Alam

{"title":"Benchmarking the performance of a high-Q cavity qudit using random unitaries","authors":"Nicholas Bornman, Tanay Roy, Joshua A Job, Namit Anand, Gabriel N Perdue, Silvia Zorzetti and M Sohaib Alam","doi":"10.1088/2058-9565/adc47c","DOIUrl":"https://doi.org/10.1088/2058-9565/adc47c","url":null,"abstract":"High-coherence cavity resonators are excellent resources for encoding quantum information in higher-dimensional Hilbert spaces, moving beyond traditional qubit-based platforms. A natural strategy is to use the Fock basis to encode information in qudits. One can perform quantum operations on the cavity mode qudit by coupling the system to a non-linear ancillary transmon qubit. However, the performance of the cavity-transmon device is limited by the noisy transmons. It is, therefore, important to develop practical benchmarking tools for these qudit systems in an algorithm-agnostic manner. We gauge the performance of these qudit platforms using sampling tests such as the heavy output generation test as well as the linear cross-entropy benchmark, by way of simulations of such a system subject to realistic dominant noise channels. We use selective number-dependent arbitrary phase and unconditional displacement gates as our universal gateset. Our results show that contemporary transmons comfortably enable controlling a few tens of Fock levels of a cavity mode. This framework allows benchmarking even higher dimensional qudits as those become accessible with improved transmons.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"34 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827709","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

Equilibrium and nonequilibrium steady states with the repeated interaction protocol: relaxation dynamics and energetic cost 重复交互协议的平衡和非平衡稳态：弛豫动力学和能量成本

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-04-10 DOI: 10.1088/2058-9565/adc7d4

Alessandro Prositto, Madeline Forbes and Dvira Segal

{"title":"Equilibrium and nonequilibrium steady states with the repeated interaction protocol: relaxation dynamics and energetic cost","authors":"Alessandro Prositto, Madeline Forbes and Dvira Segal","doi":"10.1088/2058-9565/adc7d4","DOIUrl":"https://doi.org/10.1088/2058-9565/adc7d4","url":null,"abstract":"We study the dynamics of a qubit system interacting with thermalized bath-ancilla spins via a repeated interaction scheme. Considering generic initial conditions for the system and employing a Heisenberg-type interaction between the system and the ancillas, we analytically prove the following: (i) the populations and coherences of the qubit system evolve independently toward a nonequilibrium steady-state solution, which is diagonal in the qubit’s energy eigenbasis. The population relaxes to this state geometrically, whereas the coherences decay through a more compound behavior. (ii) In the long time limit, the system approaches a steady state that generally differs from the thermal state of the ancilla. We derive this steady-state solution and show its dependence on the interaction parameters and collision frequency. (iii) We bound the number of interaction steps required to achieve the steady state within a specified error tolerance, and we evaluate the energetic cost associated with the process. Our key finding is that deterministic system-ancilla interactions do not typically result in the system thermalizing to the thermal state of the ancilla. Instead, they generate a distinct nonequilibrium steady state, which we explicitly derive. However, we also identify an operational regime that leads to thermalization with a few long and possibly randomized collisions.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"34 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819799","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

Efficient and reversible optical-to-spin conversion for solid-state quantum memories 固态量子存储器的高效可逆光自旋转换

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-04-10 DOI: 10.1088/2058-9565/adc7d3

Jingjing Chen and Mikael Afzelius

引用次数: 0

Unified sparse optimization via quantum architectures and hybrid techniques 基于量子架构和混合技术的统一稀疏优化

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-04-07 DOI: 10.1088/2058-9565/adbcd1

Wenxin Li, Chuan Wang, Hai Wei, Shuai Hou, Chongyu Cao, Chengkang Pan, Yin Ma and Kai Wen

{"title":"Unified sparse optimization via quantum architectures and hybrid techniques","authors":"Wenxin Li, Chuan Wang, Hai Wei, Shuai Hou, Chongyu Cao, Chengkang Pan, Yin Ma and Kai Wen","doi":"10.1088/2058-9565/adbcd1","DOIUrl":"https://doi.org/10.1088/2058-9565/adbcd1","url":null,"abstract":"In an era of rapid technological advancements and unprecedented data inundation, sparsity has emerged as a key property with profound implications in various fields. One important application of sparsity is sparse signal recovery, which involves reconstructing signals from limited observations and is of great importance in medical imaging, communication systems, and data compression. However, traditional sparse signal recovery methods often require computationally intensive algorithms, especially for large-scale problems. In this paper, we investigate the application of the coherent Ising machine (CIM), a hybrid quantum computing paradigm, as a novel approach to efficiently solve several sparsity-related optimization problems, presenting significant contributions in terms of model development and experimental validation. Our proposed models surpass existing approaches by reducing the computational resource requirements and enhancing problem-solving capabilities. Additionally, we also provide theoretical analysis on the performance guarantees of the proposed models, offering insights into their reliability and robustness. To further enhance the scalability and efficiency of the proposed model, we incorporate Benders Decomposition to decompose large-scale problems into smaller subproblems that can be solved more effectively. In addition, the efficiency and accuracy of the CIM-based sparse optimization approach are demonstrated through the experiments on the CIM platform, which highlights its potential to solve complex combinatorial optimization problems in practical scenarios.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"183 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797754","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

Scaling up to problem sizes: an environmental life cycle assessment of quantum computing 扩大问题规模：量子计算的环境生命周期评估

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-04-03 DOI: 10.1088/2058-9565/adc0ba

Sylvain Cordier, Karl Thibault, Marie-Luc Arpin and Ben Amor

{"title":"Scaling up to problem sizes: an environmental life cycle assessment of quantum computing","authors":"Sylvain Cordier, Karl Thibault, Marie-Luc Arpin and Ben Amor","doi":"10.1088/2058-9565/adc0ba","DOIUrl":"https://doi.org/10.1088/2058-9565/adc0ba","url":null,"abstract":"With the demonstrated ability to perform calculations in seconds that would take classical supercomputers thousands of years, quantum computers namely hold the promise of radically advancing sustainable IT. However, quantum computers face challenges due to the inherent noise in physical qubits, necessitating error correction for reliable operation in solving industrial-scale problems, which will require more computation time, energy, and electronic components than initial laboratory-scale experiments. Yet, while researchers have modeled and analyzed the environmental impacts of classical computers using Life cycle assessment the environmental performance of quantum computing remains unknown to date. This study contributes to filling this critical gap in two ways: (1) by establishing an environmental profile for quantum computers based on superconducting qubits; and (2) by comparing it to a functionally equivalent profile of a state-of-the-art supercomputer. With the comparison based on the problem size, the paper shows how the usage time can drive an environmental advantage for quantum computers under specific scaling conditions and quantum error correcting codes. The results emphasize that quantum error correction hardware has a substantial environmental impact due to the numerous electronic components needed to achieve 100 logical qubits. This paper can serve as a basis for designing more environmentally friendly quantum computers and for establishing their environmental profiles, as well as those of the human activities that will use them.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"37 1","pages":"025058"},"PeriodicalIF":6.7,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143782627","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 multiplexed quantum repeater networks 连续变量多路量子中继网络

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-04-02 DOI: 10.1088/2058-9565/adc500

Pei-Zhe Li, William J Munro, Kae Nemoto and Nicolò Lo Piparo

引用次数: 0

Heuristic-free verification-inspired quantum benchmarking 无启发式验证启发量子基准测试

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-04-02 DOI: 10.1088/2058-9565/adc298

Johannes Frank, Elham Kashefi, Dominik Leichtle and Michael de Oliveira

引用次数: 0

Ensuring superior learning outcomes and data security for authorized learner 确保经授权的学习者获得卓越的学习成果和数据安全

IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2025-04-02 DOI: 10.1088/2058-9565/adc501

Jeongho Bang, Wooyeong Song, Kyujin Shin and Yong-Su Kim

{"title":"Ensuring superior learning outcomes and data security for authorized learner","authors":"Jeongho Bang, Wooyeong Song, Kyujin Shin and Yong-Su Kim","doi":"10.1088/2058-9565/adc501","DOIUrl":"https://doi.org/10.1088/2058-9565/adc501","url":null,"abstract":"The learner’s ability to generate a hypothesis that closely approximates the target function is crucial in machine learning. Achieving this requires sufficient data; however, unauthorized access by an eavesdropping learner can lead to security risks. Thus, it is important to ensure the performance of the ‘authorized’ learner by limiting the quality of the training data accessible to eavesdroppers. Unlike previous studies focusing on encryption or access controls, we provide a theorem to ensure superior learning outcomes exclusively for the authorized learner with quantum label encoding. In this context, we use the probably-approximately-correct learning framework and introduce the concept of learning probability to quantitatively assess learner performance. Our theorem allows the condition that, given a training dataset, an authorized learner is guaranteed to achieve a certain quality of learning outcome, while eavesdroppers are not. Notably, this condition can be constructed based only on the authorized-learning-only measurable quantities of the training data, i.e. its size and noise degree. We validate our theoretical proofs and predictions through convolutional neural networks image classification learning.","PeriodicalId":20821,"journal":{"name":"Quantum Science and Technology","volume":"16 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766339","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