npj Quantum Information最新文献_第2页

Resource-optimized fault-tolerant simulation of the Fermi-Hubbard model and high-temperature superconductor models Fermi-Hubbard模型和高温超导体模型的资源优化容错模拟

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-08-11 DOI: 10.1038/s41534-025-01091-0

Angus Kan, Benjamin C. B. Symons

引用次数: 0

Passive demultiplexed two-photon state generation from a quantum dot 从量子点产生无源解复用双光子态

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-08-11 DOI: 10.1038/s41534-025-01083-0

Yusuf Karli, Iker Avila Arenas, Christian Schimpf, Ailton Jose Garcia Junior, Santanu Manna, Florian Kappe, René Schwarz, Gabriel Undeutsch, Maximilian Aigner, Melina Peter, Saimon F. Covre da Silva, Armando Rastelli, Gregor Weihs, Vikas Remesh

{"title":"Passive demultiplexed two-photon state generation from a quantum dot","authors":"Yusuf Karli, Iker Avila Arenas, Christian Schimpf, Ailton Jose Garcia Junior, Santanu Manna, Florian Kappe, René Schwarz, Gabriel Undeutsch, Maximilian Aigner, Melina Peter, Saimon F. Covre da Silva, Armando Rastelli, Gregor Weihs, Vikas Remesh","doi":"10.1038/s41534-025-01083-0","DOIUrl":"https://doi.org/10.1038/s41534-025-01083-0","url":null,"abstract":"High-purity multi-photon states are essential for photonic quantum computing. Among existing platforms, semiconductor quantum dots offer a promising route to scalable and deterministic multi-photon state generation. However, to fully realize their potential, we require a suitable optical excitation method. Current approaches to multi-photon generation rely on active polarization-switching elements (e.g., electro-optic modulators, EOMs) to spatio-temporally demultiplex single photons. Yet, the achievable multi-photon rate is fundamentally limited by the switching speed of the EOM. Here, we introduce a fully passive demultiplexing technique that leverages a stimulated two-photon excitation process to achieve switching rates only limited by the quantum dot lifetime. We demonstrate this method by generating two-photon states from a single quantum dot without requiring active switching elements. Our approach significantly reduces the cost of demultiplexing while shifting it to the excitation stage, enabling loss-free demultiplexing and effectively doubling the achievable multi-photon generation rate when combined with existing active demultiplexing techniques.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"18 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144819936","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

AI-assisted hyper-dimensional broadband quantum memory with efficiency above 90% in warm atoms 人工智能辅助的超维宽带量子存储器，在热原子中效率超过90%

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-08-08 DOI: 10.1038/s41534-025-01092-z

Zeliang Wu, Jinxian Guo, Zhifei Yu, Wenfeng Huang, Chun-Hua Yuan, Weiping Zhang, L. Q. Chen

{"title":"AI-assisted hyper-dimensional broadband quantum memory with efficiency above 90% in warm atoms","authors":"Zeliang Wu, Jinxian Guo, Zhifei Yu, Wenfeng Huang, Chun-Hua Yuan, Weiping Zhang, L. Q. Chen","doi":"10.1038/s41534-025-01092-z","DOIUrl":"https://doi.org/10.1038/s41534-025-01092-z","url":null,"abstract":"High-dimensional broadband quantum memory significantly expands quantum information processing capabilities, but the memory efficiency becomes insufficient when extended to high dimensions. We demonstrate an efficient quantum memory for hyper-dimensional photons encoded with orbital angular momentum (OAM) and spin angular momentum (SAM). OAM information is encoded from −5 to +5, combined with SAM encoding, enabling up to 22 dimensions. To ensure high memory efficiency, an artificial intelligence algorithm, a modified Differential Evolution (DE) algorithm using Chebyshev sampling, is developed to obtain a perfect signal-control waveform matching. Memory efficiency is experimentally achieved at 92% for single-mode Gaussian signal, 91% for information dimension of 6 and 80% for dimensional number to 22. The fidelity is achieved up to 99% for single-mode Gaussian signal, 95.5% for OAM information, 97.4% for SAM information, and 92% for whole hyper-dimensional signal, which is far beyond no-cloning limitation. Our results demonstrate superior performance and potential applications in high-dimensional quantum information processing. This achievement provides a crucial foundation for future quantum communication and quantum computing.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"15 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144797127","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

Bipartite Gaussian boson sampling in the time-frequency-bin domain with squeezed light generated by a silicon nitride microresonator 用氮化硅微谐振器产生的压缩光在时频域进行双部高斯玻色子采样

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-08-08 DOI: 10.1038/s41534-025-01087-w

Massimo Borghi, Emanuele Brusaschi, Marco Liscidini, Matteo Galli, Daniele Bajoni

引用次数: 0

All-day free-space quantum key distribution with thermal source towards quantum secure communications for unmanned vehicles 面向无人驾驶车辆量子安全通信的全天自由空间热源量子密钥分配

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-08-08 DOI: 10.1038/s41534-025-01085-y

Hanwen Yin, Peng Huang, Zehao Zhou, Tao Wang, Xueqin Jiang, Guihua Zeng

{"title":"All-day free-space quantum key distribution with thermal source towards quantum secure communications for unmanned vehicles","authors":"Hanwen Yin, Peng Huang, Zehao Zhou, Tao Wang, Xueqin Jiang, Guihua Zeng","doi":"10.1038/s41534-025-01085-y","DOIUrl":"https://doi.org/10.1038/s41534-025-01085-y","url":null,"abstract":"Unmanned vehicles (UV) demand highly secure communication system with high-cost-effectiveness. Bypassing the use of quantum coherent source and active modulations, passive-state-preparation (PSP) continuous-variable quantum key distribution (CVQKD) with thermal source provides a favorable solution for all-day cryptography communication between UVs. However, the field experiment of free-space PSP CVQKD has still not been realized due to the lack of efficient excess noise suppression techniques via high-loss free-space channels. Here, we realize the PSP CVQKD field test over an urban free-space channel with record-breaking attenuation from −12.24 dB to −15.59 dB. Specifically, a novel scheme is proposed to reduce excess noise from PSP, and efficient quantum coherence detection alongside advanced digital signal processing algorithms is developed to achieve low-noise synchronized raw data acquisition. The secure keys are successfully generated, with statistical summation values of 0.85 kbps during the day and 1.52 kbps at night, proving the viability for UV secure communication.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"35 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144797131","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

Implementation of carrier-grade quantum communication networks over 10000 km 实现万公里以上电信级量子通信网络

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-08-08 DOI: 10.1038/s41534-025-01089-8

Hao-Ze Chen, Ming-Han Li, Yu Zhou Wang, Zhen-Geng Zhao, Cheng Ye, Fei Long Li, Zhu Chen, Sheng-Long Han, Bao Tang, Ya Jun Miao, Wei Qi

{"title":"Implementation of carrier-grade quantum communication networks over 10000 km","authors":"Hao-Ze Chen, Ming-Han Li, Yu Zhou Wang, Zhen-Geng Zhao, Cheng Ye, Fei Long Li, Zhu Chen, Sheng-Long Han, Bao Tang, Ya Jun Miao, Wei Qi","doi":"10.1038/s41534-025-01089-8","DOIUrl":"https://doi.org/10.1038/s41534-025-01089-8","url":null,"abstract":"Quantum computing poses a serious threat to classical cryptographic algorithms based on computational complexity. Quantum key distribution (QKD), utilizing the principles of quantum mechanics, enables secure key exchange and has been proven to be an essential technology to resist the threat of quantum computing. China attaches great importance to the construction of QKD network to deal with this threat. In 2020, China established an integrated space-to-ground quantum communication network, which includes 32 backbone nodes and 4 metropolitan networks. Here we introduce China’s latest progress in the deployment of QKD networks, called the China Quantum Communication Network (CN-QCN). CN-QCN is an operational, long-range, and trusted-relay-based QKD network spanning over 10,000 kilometers, incorporating 145 fiber backbone nodes, and 20 metropolitan networks, which cover 17 provinces and 80 cities. Moreover, the network has deployed 6 ground stations linked with Jinan-1 quantum microsatellite. CN-QCN has not only surpassed its predecessor in scale, but also made significant advancements in multi-type QKD hybrid networking and long-range quantum network operation and maintenance. We present the network architecture, QKD implementation, and long-term performance of CN-QCN in this paper. This work lays the foundation for widespread applications of QKD in China.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"7 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144802788","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

Bidirectional nuclear polarization through electric dipole spin resonance enabled by spin-orbit interaction in a single hole planar quantum dot device 单孔平面量子点器件中自旋轨道相互作用实现的电偶极自旋共振双向核极化

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-08-07 DOI: 10.1038/s41534-025-01075-0

Sergei Studenikin, Jordan Ducatel, Olivia Ellis, Marek Korkusinski, Alex Bogan, Piotr Zawadzki, D. Guy Austing, Andrew Sachrajda

{"title":"Bidirectional nuclear polarization through electric dipole spin resonance enabled by spin-orbit interaction in a single hole planar quantum dot device","authors":"Sergei Studenikin, Jordan Ducatel, Olivia Ellis, Marek Korkusinski, Alex Bogan, Piotr Zawadzki, D. Guy Austing, Andrew Sachrajda","doi":"10.1038/s41534-025-01075-0","DOIUrl":"https://doi.org/10.1038/s41534-025-01075-0","url":null,"abstract":"Spin exchange between confined holes and nuclei has been demonstrated for zero-dimensional quantum dots by optical techniques but has not been observed for gated planar structures. Here, enabled by strong spin-orbit interaction, and under microwave (MW) illumination, we report hyperfine interaction and dynamic polarization of the nuclei with confined heavy-holes in a GaAs/AlGaAs double quantum dot device. Distinct signatures of the resultant hyperfine field on the electron dipole spin resonance (EDSR) signal include: hysteresis on sweeping the magnetic (B-) field up and down with characteristics that are strongly dependent on both MW power and B-field sweep rate; free bidirectional dragging of the EDSR condition; stable locking on resonance on a timescale of hours; slow temporal change as the hyperfine field decays (T1 nuclear decay time ~ 100 s); and oscillations in time commensurate with Larmor precession of the 75As nuclei. We attain pumped nuclear (Overhauser) fields ~ 25 mT (~20% nuclear polarization).","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"31 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144792504","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

Quantum-data-driven dynamical transition in quantum learning 量子学习中量子数据驱动的动态跃迁

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-08-06 DOI: 10.1038/s41534-025-01079-w

Bingzhi Zhang, Junyu Liu, Liang Jiang, Quntao Zhuang

{"title":"Quantum-data-driven dynamical transition in quantum learning","authors":"Bingzhi Zhang, Junyu Liu, Liang Jiang, Quntao Zhuang","doi":"10.1038/s41534-025-01079-w","DOIUrl":"https://doi.org/10.1038/s41534-025-01079-w","url":null,"abstract":"Quantum neural networks, parameterized quantum circuits optimized under a specific cost function, provide a paradigm for achieving near-term quantum advantage in quantum information processing. Understanding QNN training dynamics is crucial for optimizing their performance. However, the role of quantum data in training for supervised learning such as classification and regression remains unclear. We reveal a quantum-data-driven dynamical transition where the target values and data determine the convergence of the training. Through analytical classification over the fixed points of the dynamical equation, we reveal a comprehensive ‘phase diagram’ featuring seven distinct dynamics originating from a bifurcation with multiple codimension. Perturbative analyses identify both exponential and polynomial convergence classes. We provide a non-perturbative theory to explain the transition via generalized restricted Haar ensemble. The analytical results are confirmed with numerical simulations and experimentation on IBM quantum devices. Our findings provide guidance on constructing the cost function to accelerate convergence in QNN training.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"65 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144786832","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

Toward a linear-ramp QAOA protocol: evidence of a scaling advantage in solving some combinatorial optimization problems 走向线性斜坡QAOA协议：在解决一些组合优化问题中的缩放优势的证据

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-08-04 DOI: 10.1038/s41534-025-01082-1

J. A. Montañez-Barrera, Kristel Michielsen

{"title":"Toward a linear-ramp QAOA protocol: evidence of a scaling advantage in solving some combinatorial optimization problems","authors":"J. A. Montañez-Barrera, Kristel Michielsen","doi":"10.1038/s41534-025-01082-1","DOIUrl":"https://doi.org/10.1038/s41534-025-01082-1","url":null,"abstract":"The quantum approximate optimization algorithm (QAOA) is a promising algorithm for solving combinatorial optimization problems (COPs), with performance governed by variational parameters ({{{gamma }_{i},{beta }_{i}}}_{i = 0}^{p-1}). While most prior work has focused on classically optimizing these parameters, we demonstrate that fixed linear ramp schedules, linear ramp QAOA (LR-QAOA), can efficiently approximate optimal solutions across diverse COPs. Simulations with up to Nq = 42 qubits and p = 400 layers suggest that the success probability scales as (P({x}^{* })approx {2}^{-eta (p){N}_{q}+C}), where η(p) decreases with increasing p. For example, in Weighted Maxcut instances, η(10) = 0.22 improves to η(100) = 0.05. Comparisons with classical algorithms, including simulated annealing, Tabu Search, and branch-and-bound, show a scaling advantage for LR-QAOA. We show results of LR-QAOA on multiple QPUs (IonQ, Quantinuum, IBM) with up to Nq = 109 qubits, p = 100, and circuits requiring 21,200 CNOT gates. Finally, we present a noise model based on two-qubit gate counts that accurately reproduces the experimental behavior of LR-QAOA.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"59 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144778551","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

Deterministically separable polarization-entangled photons from battery-powered diode lasers 从电池供电的二极管激光器中确定可分离的偏振纠缠光子

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-07-31 DOI: 10.1038/s41534-025-01073-2

Zacharie M. Léger, Trevor J. Stirling, Meng Lon Iu, Amr S. Helmy

引用次数: 0