https://doi.org/10.1140/epjp/s13360-023-03999-y
Regular Article
Modes mismatch induced variation of quantum coherence for two-mode localized Gaussian states in accelerated frame
1
School of Physics and Optoelectronic, Yangtze University, 434023, Jingzhou, China
2
College of Intelligent Systems Science and Engineering, Hubei Minzu University, 445000, Enshi, China
3
Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, 102206, Beijing, China
4
Department of Astronomy, Beijing Normal University, 100875, Beijing, China
c
liutongh@yangtzeu.edu.cn
d
caoshuo@bnu.edu.cn
Received:
10
February
2023
Accepted:
17
April
2023
Published online:
27
April
2023
Quantum coherence is the basic concept of superposition of quantum states and plays an important role in quantum metrology. We show how a pair of uniformly accelerated observers with a local two-mode Gaussian quantum state affects the Gaussian quantum coherence. We find that the quantum coherence decreases with increasing acceleration, which is due to the Unruh effect that destroys the quantum resource. Essentially, the variation of quantum coherence is caused by the modes mismatch between the input and output mode. Through 2000 randomly generated states, we demonstrate that such mismatch is dominated by the acceleration effect and mildly affected by the waveform parameters. Moreover, the squeezing parameter acted as a suppressor of the reduced coherence, but it tended to be invalid in the high squeezing. In addition, the squeezing parameter can act as a suppressor of the reduced coherence, but the effect of the squeezing parameter tends to be ineffective under high squeezing conditions.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
