Abstract
We investigated the properties of quantum entanglement and mutual information in the multi-event horizon Schwarzschild-de Sitter (SdS) spacetime for massless Dirac fields. For the first time, we obtained the expression for the evolutions of the quantum state near the black hole event horizon (BEH) and cosmological event horizon (CEH) in the SdS spacetime. Under the Nariai limit, the physically accessible entanglement and mutual information are maximized, and the physically inaccessible correlations are zero. With the increase in temperature of either horizon, the physically accessible correlations experience degradation. Notably, the initial state remains entangled and can be utilized in entanglement-based quantum information processing tasks, which differs from the scalar field case. Furthermore, the degradation of physically accessible correlations is more pronounced for small-mass black holes. In contrast, the physically inaccessible correlations separated by the CEH monotonically increase with the radiation temperature, and such correlations are not decisively influenced by the effect of particle creation at the BEH. Moreover, a similar phenomenon is observed for the inaccessible correlations separated by the BEH. This result differs from the single event spacetime, in which the physically inaccessible entanglement is a monotonic function of the Hawking temperature.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 12122504, 12374408, and 12205133), and the Natural Science Foundation of Hunan Province (Grant No. 2023JJ30384).
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Liu, Q., Wu, SM., Wen, C. et al. Quantum properties of fermionic fields in multi-event horizon spacetime. Sci. China Phys. Mech. Astron. 66, 120413 (2023). https://doi.org/10.1007/s11433-023-2246-8
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DOI: https://doi.org/10.1007/s11433-023-2246-8