Cited by 42Quantum many-body systemsQuantum Information and CryptographyTheoretical and Computational Physics

Quantum speed limit and a signal of quantum criticality

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Wei, Yong-Bo, Zou, Jian, Wang, Zhao-Ming, Shao, Bin·2016·Scientific Reports

Abstract

We study the quantum speed limit time (QSLT) of a coupled system consisting of a central spin and its surrounding environment and the environment is described by a general XY spin-chain model. For initial pure state, we find that the local anomalous enhancement of the QSLT occurs near the critical point. In addition, we investigate the QSLT for arbitrary time-evolution state in the whole dynamics process and find that the QSLT will decay monotonously and rapidly at a large size of environment near the quantum critical point. These anomalous behaviors in the critical vicinity of XY spin-chain environment can be used to indicate the quantum phase transition point. Especially for the XX spin-chain environment, we find that the QSLT displays a sudden transition from discontinuous segmented values to a steady value at the critical point. In this case, the non-Makovianity and the Loschmidt echo are incapable of signaling the critical value of the transverse field, while the QSLT can still witness the quantum phase transition. So, the QSLT provides a further insight and sharper identification of quantum criticality.

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Authors
Wei, Y.-B., Zou, J., Wang, Z.-M., & Shao, B.
Affiliations
  • Beijing Institute of Technology (CN)
  • Ocean University of China (CN)
Corresponding author
Shao, Bin
Venue
Scientific Reports
Published
2016-01-19
Volume
6
Issue
1
Pages
19308-19308
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2240221211
Cited by
42
References
40
Citations by year
2026: 1 · 2025: 3 · 2024: 3 · 2023: 6 · 2022: 3 · 2021: 5 · 2020: 6 · 2019: 4 · 2018: 3 · 2017: 6 · 2016: 2
FWCI
2.36
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Natural Science Foundation of China (11274043, 11475160, 11375025)
  • Natural Science Foundation of Shandong Province (ZR2014AM023, No. ZR2014AM023)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum many-body systems
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Theoretical and Computational Physics
Keywords
quantum speed limit, quantum criticality, quantum phase transitions, central spin model, XY spin chain, XX spin chain, open quantum systems, non-Markovianity, Loschmidt echo, transverse field, critical point detection

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