npj Quantum Information最新文献_第5页

Mechanical squeezing via feedback control 通过反馈控制的机械挤压

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-19 DOI: 10.1038/s41534-026-01354-4

Chao Meng, Warwick P. Bowen

引用次数: 0

Hybrid boson sampling-neural network architecture for enhanced classification 用于增强分类的混合玻色子采样-神经网络结构

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-17 DOI: 10.1038/s41534-026-01321-z

Mohammad Sharifian, Abolfazl Bayat

引用次数: 0

Fast, unconditional reset and leakage reduction in fixed-frequency transmon qubits 固定频率传输量子比特的快速、无条件复位和泄漏减少

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-15 DOI: 10.1038/s41534-026-01356-2

Liangyu Chen, Simon Pettersson Fors, Zixian Yan, Anaida Ali, Tahereh Abad, Tangyou Huang, Amr Osman, Eleftherios Moschandreou, Benjamin Lienhard, Sandoko Kosen, Hang-Xi Li, Daryoush Shiri, Tong Liu, Stefan Hill, Abdullah-Al Amin, Robert Rehammar, Mamta Dahiya, Andreas Nylander, Marcus Rommel, Anita Fadavi Roudsari, Marco Caputo, Leif Grönberg, Joonas Govenius, Miroslav Dobsicek, Michele Faucci Giannelli, Anton Frisk Kockum, Jonas Bylander, Giovanna Tancredi

{"title":"Fast, unconditional reset and leakage reduction in fixed-frequency transmon qubits","authors":"Liangyu Chen, Simon Pettersson Fors, Zixian Yan, Anaida Ali, Tahereh Abad, Tangyou Huang, Amr Osman, Eleftherios Moschandreou, Benjamin Lienhard, Sandoko Kosen, Hang-Xi Li, Daryoush Shiri, Tong Liu, Stefan Hill, Abdullah-Al Amin, Robert Rehammar, Mamta Dahiya, Andreas Nylander, Marcus Rommel, Anita Fadavi Roudsari, Marco Caputo, Leif Grönberg, Joonas Govenius, Miroslav Dobsicek, Michele Faucci Giannelli, Anton Frisk Kockum, Jonas Bylander, Giovanna Tancredi","doi":"10.1038/s41534-026-01356-2","DOIUrl":"https://doi.org/10.1038/s41534-026-01356-2","url":null,"abstract":"On-demand qubit-state initialization is a prerequisite for quantum computation. We demonstrate such a protocol in a device consisting of fixed-frequency transmon qubits pair-wise coupled via tunable couplers — an architecture that is also compatible with the surface code. We use tunable couplers to transfer any undesired qubit excitation to the readout resonator of the qubit, from which this excitation decays into the feedline. In total, the combination of multi-level qubit reset, leakage reduction, and coupler reset takes only 88 ns to complete. Our reset scheme is fast, unconditional, and achieves fidelities above 99%, thus enabling fixed-frequency qubit architectures as future implementations of fault-tolerant quantum computers.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"96 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148728832","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

Noise protected logical qubit in an open chain of superconducting qubits with ultrastrong interactions 具有超强相互作用的超导量子比特开链中的噪声保护逻辑量子比特

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-15 DOI: 10.1038/s41534-026-01339-3

Roberto Stassi, Shilan Abo, Daniele Lamberto, Ye-Hong Chen, Adam Miranowicz, Salvatore Savasta, Franco Nori

引用次数: 0

Assessing quantum advantage for Gaussian process regression 高斯过程回归的量子优势评估

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-14 DOI: 10.1038/s41534-026-01350-8

Dominic Lowe, M. S. Kim, Roberto Bondesan

引用次数: 0

Generation of coherent quantum light from a single impurity-bound exciton 从单一杂质束缚激子产生相干量子光

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-13 DOI: 10.1038/s41534-026-01357-1

Yuxi Jiang, Christine Falter, Robert M. Pettit, Nils von den Driesch, Yurii Kutovyi, Jasvith Raj Basani, Amirehsan Alizadehherfati, Alexander Pawlis, Edo Waks

{"title":"Generation of coherent quantum light from a single impurity-bound exciton","authors":"Yuxi Jiang, Christine Falter, Robert M. Pettit, Nils von den Driesch, Yurii Kutovyi, Jasvith Raj Basani, Amirehsan Alizadehherfati, Alexander Pawlis, Edo Waks","doi":"10.1038/s41534-026-01357-1","DOIUrl":"https://doi.org/10.1038/s41534-026-01357-1","url":null,"abstract":"Impurity-bound excitons in II-VI semiconductors are promising optically active solid-state spin qubits that combine exceptional optical quantum efficiency with a low-noise spin environment. Previous studies on single impurities in these materials relied on incoherent optical excitation to generate photons. However, many quantum applications require resonant driving of quantum emitters to precisely control optical transitions and maintain coherence of the emission. Here, we demonstrate coherent optical emission of quantum light from a resonantly driven single impurity-bound exciton in ZnSe. The resonantly driven emitter exhibits bright quantum emission that preserves the phase of the resonant drive. It also features an intensity-dependent nonlinear phase shift at low photon numbers. Resonant excitation enables direct measurement of the Debye-Waller factor, determined to be 0.94, which indicates high efficiency emission to the zero-phonon line. Time-resolved resonance fluorescence measurements reveal a fast optically driven ionization process, along with a slower spontaneous ionization process having a lifetime of 21 μs due to charge tunneling from the impurity. These results pave the way for coherent generation of quantum light and low-photon-number nonlinear optics through resonant excitation of impurity-bound excitons.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"15 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148728834","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

Photon subtraction using a three-level emitter coupled to a chiral waveguide 光子减法使用一个三电平发射器耦合到一个手性波导

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-12 DOI: 10.1038/s41534-026-01338-4

Abdolreza Pasharavesh, Supratik Sarkar, Sai Sreesh Venuturumilli, Golam Bappi, Jinjin Du, Michal Bajcsy

引用次数: 0

High probability multiplexed multi-port single-photon source based on combinatorial heralding 基于组合预告的高概率复用多端口单光子源

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-11 DOI: 10.1038/s41534-026-01352-6

Baojie Hou, Haoran Ma, Zichao Zhao, Qishen Liang, Liao Ye, Bin Zhang, Yawen Tu, Fanjie Ruan, Bo Wang, Yuehai Wang, Leong Chuan Kwek, Huihui Zhu, Feng Liu, Jianyi Yang

{"title":"High probability multiplexed multi-port single-photon source based on combinatorial heralding","authors":"Baojie Hou, Haoran Ma, Zichao Zhao, Qishen Liang, Liao Ye, Bin Zhang, Yawen Tu, Fanjie Ruan, Bo Wang, Yuehai Wang, Leong Chuan Kwek, Huihui Zhu, Feng Liu, Jianyi Yang","doi":"10.1038/s41534-026-01352-6","DOIUrl":"https://doi.org/10.1038/s41534-026-01352-6","url":null,"abstract":"Scalable quantum photonic technologies require the simultaneous production of highly indistinguishable multi-photon states with high probability. This need may be met, and the output probability significantly increased by multiplexed sources, which channel numerous low-probability heralded single-photon sources into a specified output mode using time or spatial multiplexing. However, conventional methods merely replicate these multiplexing units when scaled to multiple output modes, which is fundamentally inefficient because it discards many valid multi-photon events. To address this, we propose and experimentally demonstrate a novel multiplexing source architecture based on a multi-input/multi-output switching network, which can utilize combinatorial photon events. A super-exponential enhancement in multi-port single-photon creation is revealed by theoretical analysis, which significantly reduces the number of heralded single-photon sources needed. We demonstrate multiplexing with two output ports, supported by four integrated heralded single-photon sources. Our strategy has a generation probability of 1.60 times that of conventional methods and 2.58 times that of implementations without multiplexing. This multi-port multiplexed method opens a new avenue for establishing a solid foundation for advanced multi-photon quantum interference and large-scale quantum information processing.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"1 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148728839","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

Breaking the entanglement-fidelity tradeoff in ({mathscr{ mathcal P mathcal T }})-symmetric quantum systems 在({mathscr{ mathcal P mathcal T }})对称量子系统中打破纠缠与保真度的权衡

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-11 DOI: 10.1038/s41534-026-01348-2

Bingbing Liu, Shilei Su, Yunlan Zuo, Jian Tang, Qiongyi He, Gang Chen, Franco Nori, Hui Jing

{"title":"Breaking the entanglement-fidelity tradeoff in ({mathscr{ mathcal P mathcal T }})-symmetric quantum systems","authors":"Bingbing Liu, Shilei Su, Yunlan Zuo, Jian Tang, Qiongyi He, Gang Chen, Franco Nori, Hui Jing","doi":"10.1038/s41534-026-01348-2","DOIUrl":"https://doi.org/10.1038/s41534-026-01348-2","url":null,"abstract":"A noteworthy discovery is that the minimal evolution time is smaller for parity-time (({mathcal{PT}}))-symmetric systems compared to Hermitian setups. Moreover, there is a significant acceleration of two-qubit quantum entanglement preparation near an exceptional point (EP), or spectral coalescence, within such a system. Nevertheless, an important problem often overlooked for quantum EP-based devices is their fidelity, greatly affected by the process of dissipation. We identify an inherent trade-off relation between the degree of entanglement and fidelity, and demonstrate that this limitation can be effectively overcome by harnessing an active ({mathcal{PT}})-symmetric system, which possesses balanced gain and loss, enabling maximal entanglement with rapid speed, high fidelity, and greater resilience to non-resonant and coupling strength errors. Two- to six-partite entanglement is prepared as the concrete example to show (i) how to break this inherent fidelity-entanglement trade-off even with non-balanced gain and loss, and its resilience against non-resonant errors, in contrast to passive ({mathcal{PT}})-symmetric dynamics; (ii) achieving speedups of many orders of magnitude, in contrast to conventional Hermitian dynamics. We use this approach to prepare 10-qubit entanglement to show the generality of this method. These findings highlight the potential of truly ({mathcal{PT}})-symmetric devices as a versatile platform for generating and manipulating diverse quantum resources, with implications for advancing quantum information technologies.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"25 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148728837","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

Proof-of-principle experimental demonstration of side-channel-secure quantum key distribution over 200 km 200公里侧信道安全量子密钥分发的原理验证实验演示

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-11 DOI: 10.1038/s41534-026-01346-4

Yang Zhou, Jing-Yang Liu, Chun-Hui Zhang, Chun-Wang Yi, Teng-Wen Jiang, Le-Chen Xu, Qin Wang

{"title":"Proof-of-principle experimental demonstration of side-channel-secure quantum key distribution over 200 km","authors":"Yang Zhou, Jing-Yang Liu, Chun-Hui Zhang, Chun-Wang Yi, Teng-Wen Jiang, Le-Chen Xu, Qin Wang","doi":"10.1038/s41534-026-01346-4","DOIUrl":"https://doi.org/10.1038/s41534-026-01346-4","url":null,"abstract":"Quantum key distribution (QKD) enables two remote parties to share encryption keys with information-theoretic security guaranteed by physical laws. Side-channel-secure QKD (SCS-QKD) has attracted considerable attention because it simultaneously removes source and detector side-channel vulnerabilities. Although a recent experiment demonstrated SCS-QKD over 50 km, practical implementation remains challenging due to imperfect vacuum preparation and finite-key constraints under coherent attacks. Here, following the theoretical framework of Jiang et al. [Phys. Rev. Res. 6, 013266 (2024)], we experimentally implement a practical SCS-QKD protocol using an imperfect whole-space source and rigorous finite-key analysis. Benefiting from a stable GHz-level system operating at 1.25 GHz, we extend the transmission distance to 200 km and achieve high secure key rates of 18.31 kbps, 2.55 kbps, and 196.03 bps at 100 km, 150 km, and 200 km, respectively. Our results establish a new distance record for SCS-QKD and demonstrate the feasibility of high-speed, long-distance, and practically secure quantum key distribution.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"35 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148728840","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