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Investigation of the effect of quantum measurement on parity-time symmetry

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Abstract

Symmetry, including the parity-time (PT)-symmetry, is a striking topic, widely discussed and employed in many fields. It is well-known that quantum measurement can destroy or disturb quantum systems. However, can and how does quantum measurement destroy the symmetry of the measured system? To answer the pertinent question, we establish the correlation between the quantum measurement and Floquet PT-symmetry and investigate for the first time how the measurement frequency and measurement strength affect the PT-symmetry of the measured system using the 40Ca+ ion. It is already shown that the measurement at high frequencies would break the PT symmetry. Notably, even for an inadequately fast measurement frequency, if the measurement strength is sufficiently strong, the PT symmetry breaking can occur. The current work can enhance our knowledge of quantum measurement and symmetry and may inspire further research on the effect of quantum measurement on symmetry.

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Article Open access 21 September 2021

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Authors and Affiliations

  1. Department of Physics, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha, 410073, China

    Wei-Chen Wang, Yi Xie, Man-Chao Zhang, Jie Zhang, Chun-Wang Wu, Ting Chen, Bao-Quan Ou, Wei Wu & Ping-Xing Chen

  2. Interdisciplinary Center for Quantum Information, National University of Defense Technology, Changsha, 410073, China

    Wei-Chen Wang, Yi Xie, Man-Chao Zhang, Jie Zhang, Chun-Wang Wu, Ting Chen, Bao-Quan Ou, Wei Wu & Ping-Xing Chen

Authors
  1. Wei-Chen Wang
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  2. Yi Xie
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  3. Man-Chao Zhang
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  4. Jie Zhang
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  6. Ting Chen
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  7. Bao-Quan Ou
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  8. Wei Wu
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  9. Ping-Xing Chen
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Corresponding author

Correspondence to Ping-Xing Chen.

Additional information

This work was supported by the National Basic Research Program of China (Grant No. 2016YFA0301903), and the National Natural Science Foundation of China (Grant Nos. 12074433, 12004430, 12174447, 12174448, and 11904402).

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Wang, WC., Xie, Y., Zhang, MC. et al. Investigation of the effect of quantum measurement on parity-time symmetry. Sci. China Phys. Mech. Astron. 65, 260313 (2022). https://doi.org/10.1007/s11433-022-1895-y

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