Abstract
We construct the Hayden-Preskill protocol by using a system of spin-1/2 particles and demonstrate information flows of this system which can mimic black holes. We first define an analogous black hole A as a collection of such particles. Second, we take the particles from inside to outside the black hole to define an analogous system of Hawking radiation B as outside particles. When the black hole and the radiation have the maximum entanglement at the Page time, we take an entangled pair system C and D. The particles of C fall into the black hole while their counterparts of D remain outside. If we assume rapid mixing of the particle states in the black hole A ⋃ C, can the information of C rapidly escape from the black hole like a mirror? We numerically show that if we turn on the rapid mixing in the black hole, the original information of C rapidly escapes from the black hole to outside in the form of the mutual information between B and D. On the other hand, if the mixing between A and C is not enough, the information escapes slowly. Hence, we explicitly demonstrate the original conjecture of Hayden and Preskill. We emphasize that enough mixing is an essential condition to make the Hayden-Preskill protocol functionally work.
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Acknowledgments
DY was supported by the National Research Foundation of Korea (Grant No.: 2018R1D1A1B07049126). This work was supported by the Daegu Gyeongbuk Institute of Science and Technology (DGIST) Undergraduate Group Research Project (UGRP) grant.
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Bae, JM., Kang, S., Yeom, Dh. et al. Demonstration of the Hayden-Preskill Protocol via Mutual Information. J. Korean Phys. Soc. 75, 941–947 (2019). https://doi.org/10.3938/jkps.75.941
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DOI: https://doi.org/10.3938/jkps.75.941