npj Quantum Information最新文献

Quantum frequency resampling 量子频率重采样

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-25 DOI: 10.1038/s41534-025-01076-z

Emanuele Tumbiolo, Simone Roncallo, Chiara Macchiavello, Lorenzo Maccone

引用次数: 0

Robust quantum control using reinforcement learning from demonstration 基于强化学习的鲁棒量子控制

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-25 DOI: 10.1038/s41534-025-01065-2

Shengyong Li, Yidian Fan, Xiang Li, Xinhui Ruan, Qianchuan Zhao, Zhihui Peng, Re-Bing Wu, Jing Zhang, Pengtao Song

{"title":"Robust quantum control using reinforcement learning from demonstration","authors":"Shengyong Li, Yidian Fan, Xiang Li, Xinhui Ruan, Qianchuan Zhao, Zhihui Peng, Re-Bing Wu, Jing Zhang, Pengtao Song","doi":"10.1038/s41534-025-01065-2","DOIUrl":"https://doi.org/10.1038/s41534-025-01065-2","url":null,"abstract":"Quantum control requires high-precision and robust control pulses to ensure optimal system performance. However, control sequences generated with a system model may suffer from model bias, leading to low fidelity. While model-free reinforcement learning (RL) methods have been developed to avoid such biases, training an RL agent from scratch can be time-consuming, often taking hours to gather enough samples for convergence. This challenge has hindered the broad application of RL techniques to larger and more complex quantum control issues, limiting their adaptability. In this work, we use Reinforcement Learning from Demonstration (RLfD) to leverage the control sequences generated with system models and further optimize them with RL to avoid model bias. By avoiding learning from scratch and starting with reasonable control pulse shapes, this approach can increase sample efficiency by reducing the number of samples, which can significantly reduce the training time. Thus, this method can effectively handle pulse shapes that are discretized into more than 1000 pieces without compromising final fidelity. We have simulated the preparation of several high-fidelity non-classical states using the RLfD method. We also find that the training process is more stable when using RLfD. In addition, this method is suitable for fast gate calibration using reinforcement learning.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"11 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710627","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

Counterfactual communication not achieved yet – A Comment on Salih et al. (2022) 反事实沟通尚未实现——对Salih等人的评论（2022）

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-24 DOI: 10.1038/s41534-025-00975-5

Sandu Popescu

引用次数: 0

Parameterized quantum circuits as universal generative models for continuous multivariate distributions 参数化量子电路作为连续多元分布的通用生成模型

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-22 DOI: 10.1038/s41534-025-01064-3

Alice Barthe, Michele Grossi, Sofia Vallecorsa, Jordi Tura, Vedran Dunjko

{"title":"Parameterized quantum circuits as universal generative models for continuous multivariate distributions","authors":"Alice Barthe, Michele Grossi, Sofia Vallecorsa, Jordi Tura, Vedran Dunjko","doi":"10.1038/s41534-025-01064-3","DOIUrl":"https://doi.org/10.1038/s41534-025-01064-3","url":null,"abstract":"Parameterized quantum circuits are a key component of quantum machine learning models for regression, classification, and generative tasks. Quantum Circuit Born machines produce discrete distributions over bitstrings whose length is exactly the number of qubits. To allow for distributions on continuous variables, new models have been introduced where classical randomness is uploaded into quantum circuits and expectation values are returned with a dimensionality decoupled from qubit number. While these models have been explored experimentally, their expressivity remains underexplored. In this work, we formalize this family and establish its theoretical foundation. We prove the universality of several variational circuit architectures for generating continuous multivariate distributions and derive tight resource bounds to reach universality using tools related to the Holevo bound. Our results reveal a trade-off between the number of qubits and measurements. We further explore relaxed notions of universality and present a practical use case, outlining potential domains for quantum advantage.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"98 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144677385","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

Spin-optomechanical cavity interfaces by deep subwavelength phonon-photon confinement 深亚波长声子光子约束下的自旋光力学腔界面

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-14 DOI: 10.1038/s41534-025-00999-x

Hamza Raniwala, Pratyush Anand, Stefan Krastanov, Matt Eichenfield, Matthew Trusheim, Dirk R. Englund

{"title":"Spin-optomechanical cavity interfaces by deep subwavelength phonon-photon confinement","authors":"Hamza Raniwala, Pratyush Anand, Stefan Krastanov, Matt Eichenfield, Matthew Trusheim, Dirk R. Englund","doi":"10.1038/s41534-025-00999-x","DOIUrl":"https://doi.org/10.1038/s41534-025-00999-x","url":null,"abstract":"A central goal of quantum information science is transferring qubits between space, time, and modality. Spin-based systems in solids are promising quantum memories, but high-fidelity transfer of their quantum states to telecom optical fields remains challenging. Here, we introduce a phonon-mediated interface between spins in a diamond nanobeam optomechanical crystal and telecom optical fields by a simultaneous deep-subwavelength confinement of optical and acoustic fields with mode volumes ({V}_{{rm{mech}}}/{Lambda }_{{rm{p}}}^{3} sim 1{0}^{-5}) and Vopt/λ3 ~ 10−3, respectively. This confinement boosts the spin-mechanical coupling rate of Group-IV silicon vacancy (SiV−) centers by an order of magnitude to ~ 32 MHz while retaining high acousto-optical couplings. The optical cavity couples to the spin irrespective of the emitter’s native excited states, avoiding spectral diffusion. Using Quantum Monte Carlo simulations, we estimate heralded entanglement fidelities exceeding 0.96 between two such interfaces. We anticipate broad utility beyond diamond emitter-telecom systems to most solid-state quantum memories.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"93 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622468","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 complexity transition in displaced Gaussian Boson sampling 位移高斯玻色子采样中的复杂性跃迁

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-09 DOI: 10.1038/s41534-025-01062-5

Zhenghao Li, Naomi R. Solomons, Jacob F. F. Bulmer, Raj B. Patel, Ian A. Walmsley

引用次数: 0

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

Coherent enhancement of collection of light from linear ion crystals 线性离子晶体光收集的相干增强

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-08 DOI: 10.1038/s41534-025-01058-1

Thuy Dung Tran, Daniel Babjak, Artem Kovalenko, Kratveer Singh, Tuan Minh Pham, Petr Obšil, Adam Lešundák, Ondřej Číp, Lukáš Slodička

引用次数: 0