npj Quantum Information最新文献_第3页

Quantum computation via Floquet tailored Rydberg interactions 通过Floquet定制Rydberg相互作用进行量子计算

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-09 DOI: 10.1038/s41534-025-01068-z

Jun Wu, Jin-Lei Wu, Fu-Qiang Guo, Bing-Bing Liu, Shi-Lei Su, Xue-Ke Song, Liu Ye, Dong Wang

引用次数: 0

Excessive precision compromises accuracy even with unlimited resources due to the trade-off in quantum metrology 由于量子计量中的权衡，即使在无限资源的情况下，过度的精度也会损害精度

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-08 DOI: 10.1038/s41534-025-01071-4

Cong-Gang Song, Qing-yu Cai

引用次数: 0

High dimensional counterdiabatic quantum computing 高维反绝热量子计算

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-08 DOI: 10.1038/s41534-025-01070-5

Diego Tancara, Francisco Albarrán-Arriagada

{"title":"High dimensional counterdiabatic quantum computing","authors":"Diego Tancara, Francisco Albarrán-Arriagada","doi":"10.1038/s41534-025-01070-5","DOIUrl":"https://doi.org/10.1038/s41534-025-01070-5","url":null,"abstract":"The digital version of adiabatic quantum computing enhanced by counterdiabatic driving, known as digitized counterdiabatic quantum computing, has emerged as a paradigm that opens the door to fast and low-depth algorithms. In this work, we explore the extension of this paradigm to high-dimensional systems. Specifically, we consider qutrits in the context of quadratic problems, obtaining the qutrit Hamiltonian codifications and the counterdiabatic drivings. Our findings show that qutrits can improve the solution quality up to 90 times compared to the qubit counterpart. We tested our proposal on 1000 random instances of the multiway number partitioning, max 3-cut, and portfolio optimization problems, demonstrating that, in general, without prior knowledge, it is better to use qutrits and, apparently, high-dimensional systems in general instead of qubits. Finally, considering the state-of-the-art quantum platforms, we show the experimental feasibility of our high-dimensional counterdiabatic quantum algorithms at least in a fully digital form. This work paves the way for the efficient codification of optimization problems in high-dimensional spaces and their efficient implementation using counterdiabatic quantum computing.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"17 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144578328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Conditioned quantum-assisted deep generative surrogate for particle-binary vector indicating thecalorimeter interactions 指示量热计相互作用的粒子二元矢量的条件量子辅助深度生成替代

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-07 DOI: 10.1038/s41534-025-01040-x

J. Quetzalcóatl Toledo-Marín, Sebastian Gonzalez, Hao Jia, Ian Lu, Deniz Sogutlu, Abhishek Abhishek, Colin Gay, Eric Paquet, Roger G. Melko, Geoffrey C. Fox, Maximilian Swiatlowski, Wojciech Fedorko

{"title":"Conditioned quantum-assisted deep generative surrogate for particle-binary vector indicating thecalorimeter interactions","authors":"J. Quetzalcóatl Toledo-Marín, Sebastian Gonzalez, Hao Jia, Ian Lu, Deniz Sogutlu, Abhishek Abhishek, Colin Gay, Eric Paquet, Roger G. Melko, Geoffrey C. Fox, Maximilian Swiatlowski, Wojciech Fedorko","doi":"10.1038/s41534-025-01040-x","DOIUrl":"https://doi.org/10.1038/s41534-025-01040-x","url":null,"abstract":"Particle collisions at accelerators like the Large Hadron Collider (LHC), recorded by experiments such as ATLAS and CMS, enable precise standard model measurements and searches for new phenomena. Simulating these collisions significantly influences experiment design and analysis but incurs immense computational costs, projected at millions of CPU-years annually during the high luminosity LHC (HL-LHC) phase. Currently, simulating a single event with Geant4 consumes around 1000 CPU seconds, with calorimeter simulations especially demanding. To address this, we propose a conditioned quantum-assisted generative model, integrating a conditioned variational autoencoder (VAE) and a conditioned restricted Boltzmann machine (RBM). Our RBM architecture is tailored for D-Wave’s Pegasus-structured advantage quantum annealer for sampling, leveraging the flux bias for conditioning. This approach combines classical RBMs as universal approximators for discrete distributions with quantum annealing’s speed and scalability. We also introduce an adaptive method for efficiently estimating effective inverse temperature, and validate our framework on Dataset 2 of CaloChallenge.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"685 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144568899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Minimal state-preparation times for silicon spin qubits 硅自旋量子位的最小状态准备时间

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-05 DOI: 10.1038/s41534-025-01027-8

Christopher K. Long, Nicholas J. Mayhall, Sophia E. Economou, Edwin Barnes, Crispin H. W. Barnes, Frederico Martins, David R. M. Arvidsson-Shukur, Normann Mertig

{"title":"Minimal state-preparation times for silicon spin qubits","authors":"Christopher K. Long, Nicholas J. Mayhall, Sophia E. Economou, Edwin Barnes, Crispin H. W. Barnes, Frederico Martins, David R. M. Arvidsson-Shukur, Normann Mertig","doi":"10.1038/s41534-025-01027-8","DOIUrl":"https://doi.org/10.1038/s41534-025-01027-8","url":null,"abstract":"Efficient preparation of quantum states on noisy intermediate-scale quantum processors remains a significant challenge to achieve quantum advantage. While gate-based methods have been the traditional approach, pulse-based algorithms offer promising alternatives with finer control and potentially reduced overheads. Here, we leverage the concept of minimum evolution time (MET) as a fundamental metric for evaluating and benchmarking quantum-state-preparation efficiency. Using numerical modeling, we investigate METs achievable through optimized microwave and exchange pulse sequences on silicon quantum hardware. We focus our investigations on molecular ground states and arbitrary state transitions. Our results demonstrate remarkably low METs: 2.3 ns for H2, 4.6 ns for HeH+, and 27 ns for LiH. METs consistently remain below 50 ns for arbitrary four-qubit state transitions, outperforming gate-based methods. We perform further analyses, revealing the impact of silicon device parameters on MET performance. Notably, increasing the maximal exchange amplitude from 10 MHz to 1 GHz significantly reduces METs, while higher maximal microwave drive amplitudes lead to faster state transitions. These findings surpass results reported for other quantum architectures. Our numerical analysis also demonstrates reasonable robustness of pulse-based state preparation to device imperfections and leakage. Our study contributes to developing efficient quantum-simulation techniques and provides insights into the strengths of silicon quantum hardware.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"79 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144566005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

A universal circuit set using the S3 quantum double 一种使用S3量子双元的通用电路

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-03 DOI: 10.1038/s41534-025-01063-4

Liyuan Chen, Yuanjie Ren, Ruihua Fan, Arthur Jaffe

引用次数: 0

Noise resilience in adaptive and symmetric monitored quantum circuits 自适应和对称监控量子电路的噪声恢复能力

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-03 DOI: 10.1038/s41534-025-01057-2

Moein N. Ivaki, Teemu Ojanen, Ali G. Moghaddam

{"title":"Noise resilience in adaptive and symmetric monitored quantum circuits","authors":"Moein N. Ivaki, Teemu Ojanen, Ali G. Moghaddam","doi":"10.1038/s41534-025-01057-2","DOIUrl":"https://doi.org/10.1038/s41534-025-01057-2","url":null,"abstract":"Monitored quantum circuits offer great perspectives for exploring the interplay of quantum information and complex quantum dynamics. These systems exhibit entanglement and purification phase transitions, along with various symmetry-enforced and ordered non-equilibrium phases. The central question is whether these phases can persist in real-world noisy devices. We study the fate of the symmetry-enforced absorbing state and charge-sharpening transitions in the presence of noise, and establish that noise results in coherent and incoherent symmetry-breaking effects. The coherent effects blur the distinction between phases, turning sharp transitions into crossovers, but states far from phase boundaries largely retain their essential character. We find, corrective feedback and postselected measurements can mitigate noise, stabilizing the absorbing and charge-sharp phases. Hence, if challenges like postselection are addressed, errors do not prevent the observation of symmetry-enforced phases in noisy intermediate-scale quantum (NISQ) devices. Additionally, we propose a symmetry-based method to characterize noise and gate fidelity.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"82 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Optimization complexity and resource minimization of emitter-based photonic graph state generation protocols 基于发射体的光子图状态生成协议的优化、复杂性和资源最小化

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-01 DOI: 10.1038/s41534-025-01056-3

Evangelia Takou, Edwin Barnes, Sophia E. Economou

{"title":"Optimization complexity and resource minimization of emitter-based photonic graph state generation protocols","authors":"Evangelia Takou, Edwin Barnes, Sophia E. Economou","doi":"10.1038/s41534-025-01056-3","DOIUrl":"https://doi.org/10.1038/s41534-025-01056-3","url":null,"abstract":"Photonic graph states are important for measurement- and fusion-based quantum computing, quantum networks, and sensing. They can in principle be generated deterministically by using emitters to create the requisite entanglement. Finding ways to minimize the number of entangling gates between emitters and understanding the overall optimization complexity of such protocols is crucial for practical implementations. Here, we address these issues using graph theory concepts. We develop optimizers that minimize the number of entangling gates, reducing them by up to 75% compared to naive schemes for moderately sized random graphs. While the complexity of optimizing emitter-emitter CNOT counts is likely NP-hard, we are able to develop heuristics based on strong connections between graph transformations and the optimization of stabilizer circuits. These patterns allow us to process large graphs and still achieve a reduction of up to 66% in emitter CNOTs, without relying on subtle metrics such as edge density. We find the optimal emission orderings and circuits to prepare unencoded and encoded repeater graph states of any size, achieving global minimization of emitter and CNOT resources despite the average NP-hardness of both optimization problems. We further study the locally equivalent orbit of graphs. Although enumerating orbits is #P complete for arbitrary graphs, we analytically calculate the size of the orbit of repeater graphs and find a procedure to generate the orbit for any repeater size. Finally, we inspect the entangling gate cost of preparing any graph from a given orbit and show that we can achieve the same optimal CNOT count across the orbit.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"1 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144521131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 demonstration of high-speed continuous variable quantum key distribution enhanced by phase-sensitive amplifier 相敏放大器增强高速连续可变量子密钥分配的实验论证

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-17 DOI: 10.1038/s41534-025-01060-7

Jinpeng Liao, Zhirong Chen, Jintao Wang, Hao Xiao, Xiaojie Guo, Zhaohui Li, Dawei Wang

{"title":"Experimental demonstration of high-speed continuous variable quantum key distribution enhanced by phase-sensitive amplifier","authors":"Jinpeng Liao, Zhirong Chen, Jintao Wang, Hao Xiao, Xiaojie Guo, Zhaohui Li, Dawei Wang","doi":"10.1038/s41534-025-01060-7","DOIUrl":"https://doi.org/10.1038/s41534-025-01060-7","url":null,"abstract":"The type of system employing continuous variables, such as light field quadrature for signal modulation, is an important branch for quantum key distribution. Achieving a high key rate using quantum key distribution technology is beneficial for realizing more frequent key updates or enabling one-time pad encryption for high-speed communication tasks. However, the deficiencies of typical large-bandwidth balanced photodetectors prevent the continuous variable quantum key distribution from matching the speed of state-of-the-art classical optical communications. Previous attempts to improve the key rate have focused on designing and manufacturing high-speed balanced photodetectors. It is well known that phase-sensitive amplifiers also improve the performance of balanced photodetectors and thus the performance of key distribution, but the concept remains purely theoretical. Here, for the first time, we experimentally demonstrate a high-speed continuous-variable quantum key distribution operating with a 10 GHz balanced photodetector enhanced by phase-sensitive amplification and detection. A conjugated multi-mode continuous variable protocol is used to accommodate the phase-sensitive operations. The optical amplifier offers a 10 dB increase in the photodetector’s clearance (quantum noise over electrical noise) and improves the detection efficiency from 72% to 96%, thus enabling an overall 248.9 Mb/s key distribution rate through a 16.7 km field-deployed optical fiber.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"14 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Revising the quantum work fluctuation framework to encompass energy conservation 修正量子功涨落框架以包含能量守恒

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-06-16 DOI: 10.1038/s41534-025-01053-6

Giulia Rubino, Karen V. Hovhannisyan, Paul Skrzypczyk

{"title":"Revising the quantum work fluctuation framework to encompass energy conservation","authors":"Giulia Rubino, Karen V. Hovhannisyan, Paul Skrzypczyk","doi":"10.1038/s41534-025-01053-6","DOIUrl":"https://doi.org/10.1038/s41534-025-01053-6","url":null,"abstract":"Work is a process-based quantity, and its measurement typically requires interaction with a measuring device multiple times. While classical systems allow for non-invasive and accurate measurements, quantum systems present unique challenges due to the influence of the measuring device on the final value of work. As recent studies have shown, among these challenges is the impossibility of formulating a universal definition of work that respects energy conservation for coherent quantum systems and is compatible with the Jarzynski equality—a fluctuation relation linking the equilibrium free energy difference to the non-equilibrium work. Here, we overcome this challenge by introducing a genuinely quantum, positive correction to the Jarzynski equality stemming from imposing energy conservation. When sufficiently large, this correction forces quantum work to violate the second law more often. Moreover, we construct modified two-point measurement (TPM) schemes for work, along with circuit implementations for them. These measurement schemes correctly certify energy conservation and remain consistent with our quantum-corrected fluctuation relation.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"12 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144296019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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