npj Quantum Information最新文献_第3页

Demonstration of quantum network protocols over a 14-km urban fiber link 通过 14 千米城市光纤链路演示量子网络协议

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-09-14 DOI: 10.1038/s41534-024-00886-x

Stephan Kucera, Christian Haen, Elena Arenskötter, Tobias Bauer, Jonas Meiers, Marlon Schäfer, Ross Boland, Milad Yahyapour, Maurice Lessing, Ronald Holzwarth, Christoph Becher, Jürgen Eschner

引用次数: 0

Experimental preparation of multiphoton-added coherent states of light 光的多光子相干态的实验制备

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-09-14 DOI: 10.1038/s41534-024-00885-y

Jiří Fadrný, Michal Neset, Martin Bielak, Miroslav Ježek, Jan Bílek, Jaromír Fiurášek

{"title":"Experimental preparation of multiphoton-added coherent states of light","authors":"Jiří Fadrný, Michal Neset, Martin Bielak, Miroslav Ježek, Jan Bílek, Jaromír Fiurášek","doi":"10.1038/s41534-024-00885-y","DOIUrl":"https://doi.org/10.1038/s41534-024-00885-y","url":null,"abstract":"Conditional addition of photons represents a crucial tool for optical quantum state engineering and it forms a fundamental building block of advanced quantum photonic devices. Here we report on experimental implementation of the conditional addition of several photons. We demonstrate the addition of one, two, and three photons to input coherent states with various amplitudes. The resulting highly nonclassical photon-added states are completely characterized with time-domain homodyne tomography, and the nonclassicality of the prepared states is witnessed by the negativity of their Wigner functions. We experimentally demonstrate that the conditional addition of photons realizes approximate noiseless quantum amplification of coherent states with sufficiently large amplitude. We also investigate certification of the stellar rank of the generated multiphoton-added coherent states, which quantifies the non-Gaussian resources required for their preparation. Our results pave the way towards the experimental realization of complex optical quantum operations based on combination of multiple photon additions and subtractions.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":null,"pages":null},"PeriodicalIF":7.6,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142231454","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

An extremely bad-cavity laser 极差腔激光器

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-09-13 DOI: 10.1038/s41534-024-00880-3

Jia Zhang, Tiantian Shi, Jianxiang Miao, Deshui Yu, Jingbiao Chen

{"title":"An extremely bad-cavity laser","authors":"Jia Zhang, Tiantian Shi, Jianxiang Miao, Deshui Yu, Jingbiao Chen","doi":"10.1038/s41534-024-00880-3","DOIUrl":"https://doi.org/10.1038/s41534-024-00880-3","url":null,"abstract":"Lasing in the bad-cavity regime has promising applications in quantum precision measurement and frequency metrology due to the reduced sensitivity of the laser frequency to cavity-length fluctuations. Thus far, relevant studies have been mainly focused on conventional cavities whose finesse is high enough that the resonance linewidth is sufficiently narrow compared to the cavity’s free spectral range, though still in the bad-cavity regime. However, lasing output from the cavity whose finesse is close to the limit of 2 has never been experimentally accessed. Here, we demonstrate an extremely bad-cavity laser, analyze the physical mechanisms limiting cavity finesse, and report on the worst-ever laser cavity with finesse reaching 2.01. The optical cavity has a reflectance close to zero and only provides weak optical feedback. The laser power can be as high as tens of μW and the spectral linewidth reaches a few kHz, over one thousand times narrower than the gain bandwidth. In addition, the measurement of cavity pulling reveals a pulling coefficient of 0.0148, the lowest value ever achieved for a continuous-wave laser. Our findings open up an unprecedentedly innovative perspective for future new ultra-stable lasers, which could possibly trigger future discoveries in optical clocks, cavity QED, continuous-wave superradiant laser, and explorations of quantum many-body physics.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":null,"pages":null},"PeriodicalIF":7.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142231456","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 autoencoders using mixed reference states 使用混合参考状态的量子自动编码器

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-09-13 DOI: 10.1038/s41534-024-00872-3

Hailan Ma, Gary J. Mooney, Ian R. Petersen, Lloyd C. L. Hollenberg, Daoyi Dong

引用次数: 0

Polarization-entangled photons from a whispering gallery resonator 来自耳语画廊谐振器的偏振纠缠光子

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-09-13 DOI: 10.1038/s41534-024-00876-z

Sheng-Hsuan Huang, Thomas Dirmeier, Golnoush Shafiee, Kaisa Laiho, Dmitry V. Strekalov, Gerd Leuchs, Christoph Marquardt

引用次数: 0

Large-scale simulations of Floquet physics on near-term quantum computers 在近期量子计算机上对 Floquet 物理进行大规模模拟

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-09-13 DOI: 10.1038/s41534-024-00866-1

Timo Eckstein, Refik Mansuroglu, Piotr Czarnik, Jian-Xin Zhu, Michael J. Hartmann, Lukasz Cincio, Andrew T. Sornborger, Zoë Holmes

{"title":"Large-scale simulations of Floquet physics on near-term quantum computers","authors":"Timo Eckstein, Refik Mansuroglu, Piotr Czarnik, Jian-Xin Zhu, Michael J. Hartmann, Lukasz Cincio, Andrew T. Sornborger, Zoë Holmes","doi":"10.1038/s41534-024-00866-1","DOIUrl":"https://doi.org/10.1038/s41534-024-00866-1","url":null,"abstract":"Periodically driven quantum systems exhibit a diverse set of phenomena but are more challenging to simulate than their equilibrium counterparts. Here, we introduce the Quantum High-Frequency Floquet Simulation (QHiFFS) algorithm as a method to simulate fast-driven quantum systems on quantum hardware. Central to QHiFFS is the concept of a kick operator which transforms the system into a basis where the dynamics is governed by a time-independent effective Hamiltonian. This allows prior methods for time-independent simulation to be lifted to simulate Floquet systems. We use the periodically driven biaxial next-nearest neighbor Ising (BNNNI) model, a natural test bed for quantum frustrated magnetism and criticality, as a case study to illustrate our algorithm. We implemented a 20-qubit simulation of the driven two-dimensional BNNNI model on Quantinuum’s trapped ion quantum computer. Our error analysis shows that QHiFFS exhibits not only a cubic advantage in driving frequency ω but also a linear advantage in simulation time t compared to Trotterization.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":null,"pages":null},"PeriodicalIF":7.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174995","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

Heisenberg-limited Hamiltonian learning for interacting bosons 相互作用玻色子的海森堡有限哈密顿学习

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-09-11 DOI: 10.1038/s41534-024-00881-2

Haoya Li, Yu Tong, Tuvia Gefen, Hongkang Ni, Lexing Ying

引用次数: 0

Hamiltonian dynamics on digital quantum computers without discretization error 数字量子计算机上的哈密顿动力学无离散化误差

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-09-07 DOI: 10.1038/s41534-024-00877-y

Etienne Granet, Henrik Dreyer

引用次数: 0

Engineered dissipation to mitigate barren plateaus 设计消散以缓解贫瘠高原

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-09-04 DOI: 10.1038/s41534-024-00875-0

Antonio Sannia, Francesco Tacchino, Ivano Tavernelli, Gian Luca Giorgi, Roberta Zambrini

引用次数: 0

MadQCI: a heterogeneous and scalable SDN-QKD network deployed in production facilities MadQCI：在生产设施中部署的异构、可扩展的 SDN-QKD 网络

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2024-09-02 DOI: 10.1038/s41534-024-00873-2

V. Martin, J. P. Brito, L. Ortíz, R. B. Méndez, J. S. Buruaga, R. J. Vicente, A. Sebastián-Lombraña, D. Rincón, F. Pérez, C. Sánchez, M. Peev, H. H. Brunner, F. Fung, A. Poppe, F. Fröwis, A. J. Shields, R. I. Woodward, H. Griesser, S. Roehrich, F. de la Iglesia, C. Abellán, M. Hentschel, J. M. Rivas-Moscoso, A. Pastor-Perales, J. Folgueira, D. López

{"title":"MadQCI: a heterogeneous and scalable SDN-QKD network deployed in production facilities","authors":"V. Martin, J. P. Brito, L. Ortíz, R. B. Méndez, J. S. Buruaga, R. J. Vicente, A. Sebastián-Lombraña, D. Rincón, F. Pérez, C. Sánchez, M. Peev, H. H. Brunner, F. Fung, A. Poppe, F. Fröwis, A. J. Shields, R. I. Woodward, H. Griesser, S. Roehrich, F. de la Iglesia, C. Abellán, M. Hentschel, J. M. Rivas-Moscoso, A. Pastor-Perales, J. Folgueira, D. López","doi":"10.1038/s41534-024-00873-2","DOIUrl":"https://doi.org/10.1038/s41534-024-00873-2","url":null,"abstract":"Current quantum key distribution (QKD) networks focus almost exclusively on transporting secret keys at the highest possible rate. Consequently, they are built as mostly fixed, ad hoc, logically, and physically isolated infrastructures designed to avoid any penalty to the quantum channel. This architecture is neither scalable nor cost-effective and future, real-world deployments will differ considerably. The structure of the MadQCI QKD network presented here is based on disaggregated components and modern paradigms especially designed for flexibility, upgradability, and facilitating the integration of QKD in the security and telecommunications-networks ecosystem. These underlying ideas have been tested by deploying many QKD systems from several manufacturers in a real-world, multi-tenant telecommunications network, installed in production facilities and sharing the infrastructure with commercial traffic. Different technologies have been used in different links to address the variety of situations and needs that arise in real networks, exploring a wide range of possibilities. Finally, a set of realistic use cases has been implemented to demonstrate the validity and performance of the network. The testing took place during a period close to three years, where most of the nodes were continuously active.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":null,"pages":null},"PeriodicalIF":7.6,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142118092","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