npj Quantum Information最新文献_第4页

Intermodal quantum key distribution over an 18-km free-space channel with adaptive optics and room-temperature detectors 利用自适应光学和室温探测器在18公里自由空间信道上进行多模态量子密钥分配

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-26 DOI: 10.1038/s41534-026-01358-0

Edoardo Rossi, Ilektra Karakosta-Amarantidou, Matteo Padovan, Marco Nardi, Marco Avesani, Francesco B. L. Santagiustina, Marco Taffarello, Antonio Vanzo, Stefano Bonora, Giuseppe Vallone, Paolo Villoresi, Francesco Vedovato

{"title":"Intermodal quantum key distribution over an 18-km free-space channel with adaptive optics and room-temperature detectors","authors":"Edoardo Rossi, Ilektra Karakosta-Amarantidou, Matteo Padovan, Marco Nardi, Marco Avesani, Francesco B. L. Santagiustina, Marco Taffarello, Antonio Vanzo, Stefano Bonora, Giuseppe Vallone, Paolo Villoresi, Francesco Vedovato","doi":"10.1038/s41534-026-01358-0","DOIUrl":"https://doi.org/10.1038/s41534-026-01358-0","url":null,"abstract":"Intermodal quantum key distribution at telecom wavelengths provides a hybrid interface between fiber connections and free-space links, both essential for the realization of scalable and interoperable quantum networks. Although demonstrated over short-range free-space links, long-distance implementations of intermodal quantum key distribution remain challenging, due to turbulence-induced wavefront aberrations which limit efficient single-mode fiber coupling at the optical receiver. Here, we demonstrate a real-time intermodal quantum key distribution field trial over an 18-km free-space link, connecting a remote terminal to an urban optical ground station equipped with a 40-cm-class telescope. An adaptive optics system, implementing direct wavefront sensing and high-order aberration correction, enables efficient single-mode fiber coupling and allows secure key generation of 200 bit/s using a compact state analyzer equipped with room temperature detectors. We further validate through experimental data a turbulence-based model for predicting fiber coupling efficiency, providing practical design guidelines for future intermodal quantum networks.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"12 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148853547","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

Steerability of rank-2 two-qubit entangled states 秩2双量子比特纠缠态的可操纵性

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-24 DOI: 10.1038/s41534-026-01359-z

Yu-Xuan Zhang, Jing-Ling Chen

引用次数: 0

Towards a micromechanical qubit based on quantized oscillations in superfluid helium 基于超流氦的量子化振荡的微力学量子位

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-24 DOI: 10.1038/s41534-026-01355-3

Priya Sharma, Jens Koch, Eran Ginossar

引用次数: 0

Preparing squeezed, cat and GKP states with parity measurements 用宇称测量方法制备压缩、cat和GKP态

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-22 DOI: 10.1038/s41534-026-01361-5

Zhiyuan Lin, Sen Li, Jingyan Feng, Kaixuan Zhou, Theodore Mollano, Valentin Ivannikov, Matteo Fadel, Tim Byrnes

{"title":"Preparing squeezed, cat and GKP states with parity measurements","authors":"Zhiyuan Lin, Sen Li, Jingyan Feng, Kaixuan Zhou, Theodore Mollano, Valentin Ivannikov, Matteo Fadel, Tim Byrnes","doi":"10.1038/s41534-026-01361-5","DOIUrl":"https://doi.org/10.1038/s41534-026-01361-5","url":null,"abstract":"Bosonic modes constitute a central resource in a wide range of quantum technologies, providing long-lived degrees of freedom for the storage, processing, and transduction of quantum information. Such modes naturally arise in platforms including circuit quantum electrodynamics, quantum acoustodynamics, and trapped-ion systems. In these architectures, coherent control and high-fidelity readout of the bosonic degrees of freedom are achieved via coupling to an auxiliary qubit. When operated in the strong dispersive regime, this interaction enables parity measurements of the mode which, in combination with phase-space displacements, constitute a standard experimental tool for full Wigner-function tomography. Here, we propose a protocol based on displaced parity measurements that allows for the preparation of a variety of bosonic quantum states. We demonstrate the generation of squeezed states, achieving ~9 dB of quantum noise reduction after three parity measurements, and larger squeezing with an increasing number of measurements in the lossless case. The technique can be generalized to the preparation of other paradigmatic bosonic states, including cat and Gottesman-Kitaev-Preskill states. Using more general dispersive measurements and displacements, we show that the scheme is universal, such that it is possible to prepare an arbitrary state.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"14 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148769260","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 quenches from the critical point: theory and experimental validation in a trapped-ion quantum simulator 临界点处的量子猝灭：困离子量子模拟器的理论与实验验证

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-22 DOI: 10.1038/s41534-026-01281-4

Chen-Xu Wang, András Grabarits, Jin-Ming Cui, Hua-Bi Zeng, Yun-Feng Huang, Chuan-Feng Li, Adolfo del Campo

引用次数: 0

Quantum algorithm for linear matrix equations 线性矩阵方程的量子算法

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-21 DOI: 10.1038/s41534-026-01360-6

Rolando D. Somma, Guang Hao Low, Dominic W. Berry, Ryan Babbush

引用次数: 0

Sequential state preparation and measurement of multiple qubits via a single channel 顺序状态准备和测量多个量子位通过一个单一的通道

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-21 DOI: 10.1038/s41534-026-01353-5

I. D. Thorvaldson, Y.-L. Hsueh, S. Monir, S. K. Gorman, M. Y. Simmons

引用次数: 0

Non-Markovianity induced by Pauli twirling 泡利旋转引起的非马尔可夫性

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-20 DOI: 10.1038/s41534-026-01345-5

Joris Kattemölle, Balázs Gulácsi, Guido Burkard

{"title":"Non-Markovianity induced by Pauli twirling","authors":"Joris Kattemölle, Balázs Gulácsi, Guido Burkard","doi":"10.1038/s41534-026-01345-5","DOIUrl":"https://doi.org/10.1038/s41534-026-01345-5","url":null,"abstract":"Noise forms a central obstacle to effective quantum information processing. Recent experimental advances enable noise tailoring through Pauli twirling, transforming arbitrary noise channels into Pauli channels. This is essential for fault-tolerant quantum computation, noise characterization, and error mitigation. Pauli-Lindblad channels aptly parameterize quasi-local Pauli channels, where negative Pauli-Lindblad parameters have been excluded on the basis of Markovianity of the noise processes. We study how Pauli twirling affects Markovianity using two established notions, which we term channel semigroup Markovianity for channels and Markovianity by divisibility for channel families. We prove that (1) any Pauli channel with nonzero Pauli eigenvalues admits a Pauli-Lindblad parameterization if complex Pauli-Lindblad parameters are allowed, and (2) a Pauli channel with strictly positive and nondegenerate eigenvalues fails to be channel semigroup Markovian if and only if at least one of its Pauli-Lindblad parameters is negative. Using this, we show that Pauli twirling can break channel semigroup Markovianity, even when the underlying noise process is Markovian by divisibility, an important example being the standard implementation of the (sqrt{X}) gate. Thus, allowing negative or even nonreal Pauli-Lindblad parameters is necessary for correct noise descriptions in experimentally relevant scenarios, with direct implications for quantum error mitigation protocols that rely on accurate noise characterization.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"1 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148769262","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

Excited state preparation on a quantum computer through adiabatic light-matter coupling 通过绝热光-物质耦合在量子计算机上制备激发态

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-20 DOI: 10.1038/s41534-026-01327-7

Hugh G. A. Burton, Maria-Andreea Filip

引用次数: 0

Restoring polarization entanglement from solid-state photon sources by time-dependent photonic control 利用时变光子控制恢复固态光子源的偏振纠缠

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2026-08-20 DOI: 10.1038/s41534-026-01351-7

Ismail Nassar, Dan Cogan, Ido Schwartz

{"title":"Restoring polarization entanglement from solid-state photon sources by time-dependent photonic control","authors":"Ismail Nassar, Dan Cogan, Ido Schwartz","doi":"10.1038/s41534-026-01351-7","DOIUrl":"https://doi.org/10.1038/s41534-026-01351-7","url":null,"abstract":"Quantum states of light are central resources for quantum communication, networking, and photonic information processing. In many quantum emitters, coherent internal dynamics arising from intrinsic or field-induced level splittings imprint a deterministic, time-dependent phase on the emitted light. When emission times are stochastic and detector timing resolution is finite, this phase evolution becomes effectively unresolved, suppressing observable entanglement. Here, we demonstrate a photonic-compensation protocol that removes this emitter-induced phase evolution directly in the photonic domain. Rather than modifying the emitter, we apply synchronized, time-dependent coherent operations to the emitted photons that reverse the accumulated phase independently of the emission time. Using exciton fine-structure splitting in a semiconductor quantum dot as a model system, we implement dynamic phase modulation and perform time-resolved two-photon polarization tomography. We show that this restores a stationary two-photon polarization state and recovers polarization entanglement without temporal post-selection and independently of detector timing resolution. Our approach provides a scalable route to robust solid-state entangled-photon sources and, more broadly, establishes a strategy for removing the imprint of coherent emitter dynamics on photonic entanglement in integrated platforms.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"42 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148769279","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