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Quantum entanglement in the background of cosmic string spacetime

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Abstract

We examine the entanglement behaviors for two static atoms coupled to a massless scalar field in the cosmic string spacetime. The entanglement measure is calculated for different cases for two atoms initially prepared in the Werner state. It is found that entanglement behaviors depend on vacuum fluctuation, two-atom distance and nontrivial spacetime topology. When deficit angle parameter \(\nu =1\), the evolution model reduces to that of Minkowski spacetime. When two-atom distance is sufficiently small, entanglement can be preserved from the impact of vacuum fluctuation to some extent. Large deficit angle parameter can accelerate destruction of entanglement and shorten lifetime of entanglement. Entanglement presents slight oscillating behavior as atom–string distance varies. A large atom–string distance can retard the entanglement decay and extend entanglement lifetime as a whole. Our exploration may be useful to sense the cosmic string spacetime topology structure and property in principle.

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Acknowledgements

This work is supported by National Natural Science Foundation of China (Grant Nos. 61802061, 61871205) and the Innovation Project of Department of Education of Guangdong Province of China (2017KTSCX180, 2019KTSCX188), Doctoral Program of Guangdong Natural Science Foundation (2016A030310001) and the Guangdong philosophy and social science planning project (GD15XGL55).

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Authors and Affiliations

  1. School of Economics and Management, Wuyi University, Jiangmen, 529020, China

    Zhiming Huang

  2. School of Electronic and Information Engineering, Foshan University, Foshan, 528000, China

    Zhimin He

  3. Center for Quantum Computing, Peng Cheng Laboratory, Shenzhen, 518055, China

    Zhimin He

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  1. Zhiming Huang
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  2. Zhimin He
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Correspondence to Zhimin He.

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Huang, Z., He, Z. Quantum entanglement in the background of cosmic string spacetime. Quantum Inf Process 19, 298 (2020). https://doi.org/10.1007/s11128-020-02796-1

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