npj Quantum Information最新文献_第6页

Mitigating errors in analog quantum simulation by Hamiltonian reshaping or Hamiltonian rescaling 通过哈密顿重塑或哈密顿重标度来减轻模拟量子模拟中的误差

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-28 DOI: 10.1038/s41534-025-00969-3

Rui-Cheng Guo, Yanwu Gu, Dong E. Liu

{"title":"Mitigating errors in analog quantum simulation by Hamiltonian reshaping or Hamiltonian rescaling","authors":"Rui-Cheng Guo, Yanwu Gu, Dong E. Liu","doi":"10.1038/s41534-025-00969-3","DOIUrl":"https://doi.org/10.1038/s41534-025-00969-3","url":null,"abstract":"Simulating quantum many-body systems is crucial for advancing physics but poses substantial challenges for classical computers. Quantum simulations overcome these limitations, with analog simulators offering unique advantages over digital methods, such as lower systematic errors and reduced circuit depth, making them efficient for studying complex quantum phenomena. However, unlike their digital counterparts, analog quantum simulations face significant limitations due to the absence of effective error mitigation techniques. This work introduces two novel error mitigation strategies—Hamiltonian reshaping and Hamiltonian rescaling—in analog quantum simulation for tasks like eigen-energy evaluation. Hamiltonian reshaping uses random unitary transformations to generate new Hamiltonians with identical eigenvalues but varied eigenstates, allowing error reduction through averaging. Hamiltonian rescaling mitigates errors by comparing eigenvalue estimates from energy-scaled Hamiltonians. Numerical calculations validate both methods, demonstrating their significant practical effectiveness in enhancing the accuracy and reliability of analog quantum simulators.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"25 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049901","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

Codes for entanglement-assisted classical communication 用于纠缠辅助经典通信的代码

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-27 DOI: 10.1038/s41534-024-00954-2

Tushita Prasad, Markus Grassl

引用次数: 0

Faster-than-Clifford simulations of entanglement purification circuits and their full-stack optimization 比克利福德更快的纠缠净化电路模拟及其全栈优化

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-23 DOI: 10.1038/s41534-024-00948-0

Vaishnavi L. Addala, Shu Ge, Stefan Krastanov

引用次数: 0

Fabrication and characterization of low-loss Al/Si/Al parallel plate capacitors for superconducting quantum information applications 用于超导量子信息应用的低损耗Al/Si/Al平行板电容器的制备与表征

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-22 DOI: 10.1038/s41534-025-00967-5

Anthony P. McFadden, Aranya Goswami, Tongyu Zhao, Teun van Schijndel, Trevyn F. Q. Larson, Sudhir Sahu, Stephen Gill, Florent Lecocq, Raymond Simmonds, Chris Palmstrøm

{"title":"Fabrication and characterization of low-loss Al/Si/Al parallel plate capacitors for superconducting quantum information applications","authors":"Anthony P. McFadden, Aranya Goswami, Tongyu Zhao, Teun van Schijndel, Trevyn F. Q. Larson, Sudhir Sahu, Stephen Gill, Florent Lecocq, Raymond Simmonds, Chris Palmstrøm","doi":"10.1038/s41534-025-00967-5","DOIUrl":"https://doi.org/10.1038/s41534-025-00967-5","url":null,"abstract":"Increasing the density of superconducting circuits requires compact components, however, superconductor-based capacitors typically perform worse as dimensions are reduced due to loss at surfaces and interfaces. Here, parallel plate capacitors composed of aluminum-contacted, crystalline silicon fins are shown to be a promising technology for use in superconducting circuits by evaluating the performance of lumped element resonators and transmon qubits. High aspect ratio Si-fin capacitors having widths below 300 nm with an approximate total height of 3 μm are fabricated using anisotropic wet etching of Si(110) substrates followed by aluminum metallization. The single-crystal Si capacitors are incorporated in lumped element resonators and transmons by shunting them with lithographically patterned aluminum inductors and conventional Al/AlOx/Al Josephson junctions respectively. Microwave characterization of these devices suggests state-of-the-art performance for superconducting parallel plate capacitors with low power internal quality factor of lumped element resonators greater than 500 k and qubit T1 times greater than 25 μs. These results suggest that Si-Fins are a promising technology for applications that require low-loss, compact, superconductor-based capacitors with minimal stray capacitance.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"13 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020773","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

Long-time error-mitigating simulation of open quantum systems on near term quantum computers 开放量子系统在近期量子计算机上的长时间容错模拟

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-21 DOI: 10.1038/s41534-025-00964-8

Brian Rost, Lorenzo Del Re, Nathan Earnest, Alexander F. Kemper, Barbara Jones, James K. Freericks

引用次数: 0

Dephasing enabled fast charging of quantum batteries 减相使量子电池能够快速充电

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-19 DOI: 10.1038/s41534-025-00959-5

Rahul Shastri, Chao Jiang, Guo-Hua Xu, B. Prasanna Venkatesh, Gentaro Watanabe

引用次数: 0

Noise-agnostic quantum error mitigation with data augmented neural models 基于数据增强神经模型的噪声不可知量子误差缓解

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-18 DOI: 10.1038/s41534-025-00960-y

Manwen Liao, Yan Zhu, Giulio Chiribella, Yuxiang Yang

引用次数: 0

First-order phase transition of the Schwinger model with a quantum computer Schwinger模型的一阶相变与量子计算机

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-18 DOI: 10.1038/s41534-024-00950-6

Takis Angelides, Pranay Naredi, Arianna Crippa, Karl Jansen, Stefan Kühn, Ivano Tavernelli, Derek S. Wang

{"title":"First-order phase transition of the Schwinger model with a quantum computer","authors":"Takis Angelides, Pranay Naredi, Arianna Crippa, Karl Jansen, Stefan Kühn, Ivano Tavernelli, Derek S. Wang","doi":"10.1038/s41534-024-00950-6","DOIUrl":"https://doi.org/10.1038/s41534-024-00950-6","url":null,"abstract":"We explore the first-order phase transition in the lattice Schwinger model in the presence of a topological θ-term by means of the variational quantum eigensolver (VQE). Using two different fermion discretizations, Wilson and staggered fermions, we develop parametric ansatz circuits suitable for both discretizations, and compare their performance by simulating classically an ideal VQE optimization in the absence of noise. The states obtained by the classical simulation are then prepared on the IBM’s superconducting quantum hardware. Applying state-of-the art error-mitigation methods, we show that the electric field density and particle number, observables which reveal the phase structure of the model, can be reliably obtained from the quantum hardware. To investigate the minimum system sizes required for a continuum extrapolation, we study the continuum limit using matrix product states, and compare our results to continuum mass perturbation theory. We demonstrate that taking the additive mass renormalization into account is vital for enhancing the precision that can be obtained with smaller system sizes. Furthermore, for the observables we investigate we observe excellent agreement in the continuum limit of both fermion discretizations.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"7 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989361","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

Practical security of twin-field quantum key distribution with optical phase-locked loop under wavelength-switching attack 波长切换攻击下光锁相环双场量子密钥分配的实际安全性

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-18 DOI: 10.1038/s41534-025-00963-9

Qingquan Peng, Jiu-Peng Chen, Tianyi Xing, Dongyang Wang, Yizhi Wang, Yang Liu, Anqi Huang

{"title":"Practical security of twin-field quantum key distribution with optical phase-locked loop under wavelength-switching attack","authors":"Qingquan Peng, Jiu-Peng Chen, Tianyi Xing, Dongyang Wang, Yizhi Wang, Yang Liu, Anqi Huang","doi":"10.1038/s41534-025-00963-9","DOIUrl":"https://doi.org/10.1038/s41534-025-00963-9","url":null,"abstract":"The twin-field class quantum key distribution (TF-class QKD) has experimentally demonstrated the ability to surpass the fundamental rate-distance limit without requiring a quantum repeater, as a revolutional milestone. In TF-class QKD implementation, an optical phase-locked loop (OPLL) structure is commonly employed to generate a reference light with correlated phase, ensuring coherence of optical fields between Alice and Bob. In this configuration, the reference light, typically located in the untrusted station Charlie, solely provides wavelength reference for OPLL and does not participate in quantum-state encoding. However, the reference light may open a door for Eve to enter the source stations that are supposed to be well protected. Here, by identifying vulnerabilities of an acousto-optic modulator (AOM) in the OPLL scheme, we propose and demonstrate a wavelength-switching attack on a TF-class QKD system. This attack involves Eve deliberately manipulating the wavelength of the reference light to increase mean photon number of prepared quantum states, while maintaining stable interference between Alice and Bob as required by TF-class QKD protocols. The maximum observed increase in mean photon number is 8.7%, which has been theoretically proven to compromise the security of a TF-class QKD system. Moreover, we have shown that with well calibration of the modulators, the attack can be eliminated. Through this study, we highlight the importance of system calibration in the practical security in TF-class QKD implementation.","PeriodicalId":19212,"journal":{"name":"npj Quantum Information","volume":"7 1","pages":""},"PeriodicalIF":7.6,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989366","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

Ultra-dispersive resonator readout of a quantum-dot qubit using longitudinal coupling 利用纵向耦合的量子点量子比特的超色散谐振器读出

IF 7.6 1区物理与天体物理

npj Quantum Information Pub Date : 2025-01-17 DOI: 10.1038/s41534-025-00962-w

Benjamin Harpt, J. Corrigan, Nathan Holman, Piotr Marciniec, D. Rosenberg, D. Yost, R. Das, Rusko Ruskov, Charles Tahan, William D. Oliver, R. McDermott, Mark Friesen, M. A. Eriksson

引用次数: 0