npj Quantum Information最新文献_第3页

Microwave-coupled optical bistability in driven and interacting Rydberg gases 驱动和相互作用里德伯气体中的微波耦合光学双稳性

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-03-12 DOI: 10.1038/s41534-025-00997-z

Zhehua Zhang, Zeyan Zhang, Shaoxing Han, Yuqing Zhang, Guoqing Zhang, Jizhou Wu, Vladimir B. Sovkov, Wenliang Liu, Yuqing Li, Linjie Zhang, Liantuan Xiao, Suotang Jia, Weibin Li, Jie Ma

引用次数: 0

Quantum Zeno Monte Carlo for computing observables 量子芝诺蒙特卡罗计算观测

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-03-12 DOI: 10.1038/s41534-025-01002-3

Mancheon Han, Hyowon Park, Sangkook Choi

引用次数: 0

Nearly quantum-limited microwave amplification via interfering degenerate stimulated emission in a single artificial atom 单人造原子中干扰简并受激辐射的近量子限制微波放大

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-03-12 DOI: 10.1038/s41534-025-00993-3

Fahad Aziz, Kuan-Ting Lin, Ping-Yi Wen, Samina, Yu-Chen Lin, Emely Weigand, Ching-Ping Lee, Yu-Ting Cheng, Yong Lu, Ching-Yeh Chen, Chin-Hsun Chien, Kai-Min Hsieh, Yu-Huan Huang, Haw-Tyng Huang, Hou Ian, Jeng-Chung Chen, Yen-Hsiang Lin, Anton Frisk Kockum, Guin-Dar Lin, Io-Chun Hoi

{"title":"Nearly quantum-limited microwave amplification via interfering degenerate stimulated emission in a single artificial atom","authors":"Fahad Aziz, Kuan-Ting Lin, Ping-Yi Wen, Samina, Yu-Chen Lin, Emely Weigand, Ching-Ping Lee, Yu-Ting Cheng, Yong Lu, Ching-Yeh Chen, Chin-Hsun Chien, Kai-Min Hsieh, Yu-Huan Huang, Haw-Tyng Huang, Hou Ian, Jeng-Chung Chen, Yen-Hsiang Lin, Anton Frisk Kockum, Guin-Dar Lin, Io-Chun Hoi","doi":"10.1038/s41534-025-00993-3","DOIUrl":"https://doi.org/10.1038/s41534-025-00993-3","url":null,"abstract":"Reaching the quantum limit for added noise in amplification processes is an important step toward many quantum technologies. Nearly quantum-limited traveling-wave parametric amplifiers with Josephson junction arrays have been developed and recently even become commercially available. However, the fundamental question of whether a single atom also can reach this quantum limit has not yet been answered in practice. Here, we investigate the amplification of a microwave probe signal by a superconducting artificial atom, a transmon, at the end of a semi-infinite transmission line, under a strong pump field. The end of the transmission line acts as a mirror for microwave fields. Due to the weak anharmonicity of the artificial atom, the strong pump field creates multi-photon excitations among the dressed states. Transitions between these dressed states, Rabi sidebands, give rise to either amplification or attenuation of the weak probe. We obtain a maximum power amplification of 1.402 ± 0.025, higher than in any previous experiment with a single artificial atom. We achieve near-quantum-limited added noise (0.157 ± 0.003 quanta; the quantum limit is 0.143 ± 0.006 quanta for this level of amplification), due to quantum coherence between Rabi sidebands, leading to constructive interference between emitted photons.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"30 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143599516","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

Uncovering quantum many-body scars with quantum machine learning 用量子机器学习揭开量子多体伤疤

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-03-11 DOI: 10.1038/s41534-025-01005-0

Jia-Jin Feng, Bingzhi Zhang, Zhi-Cheng Yang, Quntao Zhuang

{"title":"Uncovering quantum many-body scars with quantum machine learning","authors":"Jia-Jin Feng, Bingzhi Zhang, Zhi-Cheng Yang, Quntao Zhuang","doi":"10.1038/s41534-025-01005-0","DOIUrl":"https://doi.org/10.1038/s41534-025-01005-0","url":null,"abstract":"Quantum many-body scars are rare eigenstates hidden within the chaotic spectra of many-body systems, representing a weak violation of the eigenstate thermalization hypothesis (ETH). Identifying these scars, as well as other non-thermal states in complex quantum systems, remains a significant challenge. Besides exact scar states, the nature of other non-thermal states lacking simple analytical characterization remains an open question. In this study, we employ tools from quantum machine learning—specifically, (enhanced) quantum convolutional neural networks (QCNNs), to explore hidden non-thermal states in chaotic many-body systems. Our simulations demonstrate that QCNNs achieve over 99% single-shot measurement accuracy in identifying all known scars. Furthermore, we successfully identify new non-thermal states in models such as the xorX model, the PXP model, and the far-coupling Su-Schrieffer-Heeger model. In the xorX model, some of these non-thermal states can be approximately described as spin-wave modes of specific quasiparticles. We further develop effective tight-binding Hamiltonians within the quasiparticle subspace to capture key features of these many-body eigenstates. Finally, we validate the performance of QCNNs on IBM quantum devices, achieving single-shot measurement accuracy exceeding 63% under real-world noise and errors, with the aid of error mitigation techniques. Our results underscore the potential of QCNNs to uncover hidden non-thermal states in quantum many-body systems.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"56 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143589661","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

Digital-analog quantum computing of fermion-boson models in superconducting circuits 超导电路中费米子-玻色子模型的数模量子计算

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-03-11 DOI: 10.1038/s41534-025-01001-4

Shubham Kumar, Narendra N. Hegade, Anne-Maria Visuri, Balaganchi A. Bhargava, Juan F. R. Hernandez, E. Solano, F. Albarrán-Arriagada, G. Alvarado Barrios

{"title":"Digital-analog quantum computing of fermion-boson models in superconducting circuits","authors":"Shubham Kumar, Narendra N. Hegade, Anne-Maria Visuri, Balaganchi A. Bhargava, Juan F. R. Hernandez, E. Solano, F. Albarrán-Arriagada, G. Alvarado Barrios","doi":"10.1038/s41534-025-01001-4","DOIUrl":"https://doi.org/10.1038/s41534-025-01001-4","url":null,"abstract":"High-fidelity quantum simulations demand hardware-software co-design architectures, which are crucial for adapting to complex problems such as strongly correlated dynamics in condensed matter. By leveraging co-design strategies, we can enhance the performance of state-of-the-art quantum devices in the noisy intermediate quantum (NISQ) and early error-correction regimes. In this direction, we propose a digital-analog quantum algorithm for simulating the Hubbard–Holstein model, describing strongly correlated fermion-boson interactions, in a suitable architecture with superconducting circuits. It comprises a linear chain of qubits connected by resonators, emulating electron–electron (e–e) and electron–phonon (e–p) interactions, as well as fermion tunneling. Our approach is adequate for digital-analog quantum computing (DAQC) of fermion-boson models, including those described by the Hubbard–Holstein model. We show the reduction in the circuit depth of the DAQC algorithm, a sequence of digital steps and analog blocks, outperforming the purely digital approach. We exemplify the quantum simulation of a half-filled two-site Hubbard–Holstein model. In this example, we obtain time-dependent state fidelities larger than 0.98, showing that our proposal is suitable for studying the dynamical behavior of solid-state systems. Our proposal opens the door to computing complex systems for chemistry, materials, and high-energy physics.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"91 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143589827","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

Boosted Bell-state measurements for photonic quantum computation 光子量子计算的增强钟态测量

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-03-08 DOI: 10.1038/s41534-025-00986-2

Nico Hauser, Matthias J. Bayerbach, Simone E. D’Aurelio, Raphael Weber, Matteo Santandrea, Shreya P. Kumar, Ish Dhand, Stefanie Barz

引用次数: 0

Steady-state dynamics and nonlocal correlations in thermoelectric Cooper pair splitters 热电库珀对分裂器的稳态动力学和非局域相关

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-03-08 DOI: 10.1038/s41534-025-00966-6

Arnav Arora, Siddhant Midha, Alexander Zyuzin, Pertti Hakonen, Bhaskaran Muralidharan

{"title":"Steady-state dynamics and nonlocal correlations in thermoelectric Cooper pair splitters","authors":"Arnav Arora, Siddhant Midha, Alexander Zyuzin, Pertti Hakonen, Bhaskaran Muralidharan","doi":"10.1038/s41534-025-00966-6","DOIUrl":"https://doi.org/10.1038/s41534-025-00966-6","url":null,"abstract":"Recent experiments on Cooper pair splitters using superconductor-quantum dot hybrids have embarked on creating entanglement in the solid-state, by engineering the sub-gap processes in the superconducting region. Using the thermoelectric Cooper pair splitter setup [Nat. Comm., 12, 21, (2021)] as a prototype, we present a comprehensive analysis of the fundamental components of the observed transport signal, aiming to critically clarify the operating regimes and confirm the nonlocal and nonclassical nature of correlations arising from crossed Andreev processes. By making a nexus with quantum discord, we identify operating points of nonlocal quantum correlations in the CPS device—information that cannot be extracted from the transport signal alone. A notable consequence of our analysis is the finding that contact-induced level broadening of the quantum dot’s discrete energy spectrum, along with its hybridization with the superconducting segment, can lead to shifted resonances in the crossed Andreev process as well as a parity reversal in the thermoelectric current. Our work thereby provides detailed insights into the gate voltage control of the quantum correlations in superconducting-hybrid Cooper pair splitters, revealing new avenues for harnessing quantum correlations in solid-state systems.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"12 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143575307","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

To reset, or not to reset—that is the question 重启还是不重启，这是个问题

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-03-07 DOI: 10.1038/s41534-025-00998-y

György P. Gehér, Marcin Jastrzebski, Earl T. Campbell, Ophelia Crawford

{"title":"To reset, or not to reset—that is the question","authors":"György P. Gehér, Marcin Jastrzebski, Earl T. Campbell, Ophelia Crawford","doi":"10.1038/s41534-025-00998-y","DOIUrl":"https://doi.org/10.1038/s41534-025-00998-y","url":null,"abstract":"Whether to reset qubits, or not, during quantum error correction experiments is a question of both foundational and practical importance for quantum computing. Text-book quantum error correction demands that qubits are reset after measurement. However, fast qubit reset has proven challenging to execute at high fidelity. Consequently, many cutting-edge quantum error correction experiments are opting for the no-reset approach, where physical reset is not performed. It has recently been postulated that no-reset is functionally equivalent to reset procedures, as well as being faster and easier. For memory experiments, we confirm numerically that resetting provides no benefit. On the other hand, we identify a remarkable difference during logical operations. We find that unconditionally resetting qubits can reduce the duration of fault-tolerant logical operation by up to a factor of two as the number of measurement errors that can be tolerated is doubled. We support this with numerical simulations. However, our simulations also reveal that the no-reset performance is superior if the reset duration and infidelity exceed given thresholds. For example, with the noise model we considered, we find the no-reset performance to be superior when the reset duration is greater than approximately 100 ns and the physical error probability is greater than approximately 10−2.5 ≈ 0.003. Lastly, we introduce two novel syndrome extraction circuits that can reduce the time overhead of no-reset approaches. Our findings provide guidance on how experimentalists should design future experiments.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"67 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570453","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 error mitigation in quantum annealing 量子退火中的量子误差缓解

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-03-06 DOI: 10.1038/s41534-025-00977-3

Jack Raymond, Mohammad H. Amin, Andrew D. King, Richard Harris, William Bernoudy, Andrew J. Berkley, Kelly Boothby, Anatoly Smirnov, Fabio Altomare, Michael Babcock, Catia Baron, Jake Connor, Martin H. Dehn, Colin Enderud, Emile Hoskinson, Shuiyuan Huang, Mark W. Johnson, Eric Ladizinsky, Trevor Lanting, Allison J. R. MacDonald, Gaelen Marsden, Reza Molavi, Travis Oh, Gabriel Poulin-Lamarre, Hugh Ramp, Chris Rich, Berta Trullas Clavera, Nicholas Tsai, Mark Volkmann, Jed D. Whittaker, Jason Yao, Niclas Heinsdorf, Nitin Kaushal, Alberto Nocera, Marcel Franz, Jacek Dziarmaga

{"title":"Quantum error mitigation in quantum annealing","authors":"Jack Raymond, Mohammad H. Amin, Andrew D. King, Richard Harris, William Bernoudy, Andrew J. Berkley, Kelly Boothby, Anatoly Smirnov, Fabio Altomare, Michael Babcock, Catia Baron, Jake Connor, Martin H. Dehn, Colin Enderud, Emile Hoskinson, Shuiyuan Huang, Mark W. Johnson, Eric Ladizinsky, Trevor Lanting, Allison J. R. MacDonald, Gaelen Marsden, Reza Molavi, Travis Oh, Gabriel Poulin-Lamarre, Hugh Ramp, Chris Rich, Berta Trullas Clavera, Nicholas Tsai, Mark Volkmann, Jed D. Whittaker, Jason Yao, Niclas Heinsdorf, Nitin Kaushal, Alberto Nocera, Marcel Franz, Jacek Dziarmaga","doi":"10.1038/s41534-025-00977-3","DOIUrl":"https://doi.org/10.1038/s41534-025-00977-3","url":null,"abstract":"Quantum error mitigation (QEM) presents a promising near-term approach to reducing errors when estimating expectation values in quantum computing. Here, we introduce QEM techniques tailored for quantum annealing, using zero-noise extrapolation (ZNE). We implement ZNE through zero-temperature and zero-time extrapolations. The practical zero-time extrapolation developed exploits the Kibble-Zurek mechanism so that only problem-Hamiltonian rescaling is required. We conduct experimental investigations into the quantum critical and post-critical dynamics of a transverse-field Ising spin chain by examining statistics with weak and strong post-critical dynamics. We demonstrate successful mitigation of thermal noise and non-thermal errors through both of these extrapolation techniques.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"16 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560620","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

Boosted quantum teleportation 增强量子隐形传态

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-03-04 DOI: 10.1038/s41534-025-00992-4

Simone E. D’Aurelio, Matthias J. Bayerbach, Stefanie Barz

引用次数: 0