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Observation of many-body Fock space dynamics in two dimensions
2023-07-10
Online publication date2023-07
Source PublicationNature Physics   Impact Factor & Quartile
ISSN1745-2473 ; 1745-2481
page numbers8
AbstractSome many-body problems are challenging to solve in real space, but have a convenient Fock-space representation. A superconducting qubit experiment now demonstrates the benefits of this approach for the study of quantum dynamics and criticality. Quantum simulation provides platforms to study fundamental aspects of many-body physics in a controlled way, and to explore their implications for quantum technology. However, the dimension of the Hilbert space grows exponentially with the number of interacting particles, which means that investigations of strongly correlated problems such as quantum criticality and many-body localization in terms of few-body probes in real space are often insufficient. Here we demonstrate how to tackle such questions on a superconducting quantum processor from a Fock-space perspective. We map a many-body system onto an unconventional Anderson model on a network of many-body states, which allows the direct observation of wave-packet propagation in Fock space. We find a quantum-critical regime of anomalously enhanced wave-packet width and deduce a critical point from the maximum wave-packet fluctuations, which lends support to the two-dimensional many-body localization transition in finite-sized systems. Our results introduce an alternative picture for characterizing many-body dynamics and for exploring the controversial problems such as criticality and dimensionality. Moreover, the protocol is universal and scalable, and is therefore a promising strategy to solve a broader range of many-body problems on future quantum devices.
PublisherNATURE PORTFOLIO
DOI10.1038/s41567-023-02133-0
Indexed BySCIE
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:001022795400001
Original Document TypeArticle ; Early Access
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/568798
Collection兰州大学
物理科学与技术学院
Corresponding AuthorYing, Lei; Guo, Qiujiang
Affiliation
1.Zhejiang Univ, ZJU Hangzhou Global Sci & Technol Innovat Ctr, Interdisciplinary Ctr Quantum Informat, Sch Phys, Hangzhou, Peoples R China;
2.Zhejiang Univ, Zhejiang Prov Key Lab Quantum Technol & Device, Hangzhou, Peoples R China;
3.Lanzhou Univ, Lanzhou Ctr Theoret Phys, Sch Phys Sci & Technol, Lanzhou, Gansu, Peoples R China;
4.Lanzhou Univ, Key Lab Theoret Phys Gansu Prov, Lanzhou, Gansu, Peoples R China;
5.Beijing Computat Sci Res Ctr, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Yao, Yunyan,Xiang, Liang,Guo, Zexian,et al. Observation of many-body Fock space dynamics in two dimensions[J]. Nature Physics,2023.
APA Yao, Yunyan.,Xiang, Liang.,Guo, Zexian.,Bao, Zehang.,Yang, Yong-Feng.,...&Guo, Qiujiang.(2023).Observation of many-body Fock space dynamics in two dimensions.Nature Physics.
MLA Yao, Yunyan,et al."Observation of many-body Fock space dynamics in two dimensions".Nature Physics (2023).
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