Published in

IOP Publishing, New Journal of Physics, 5(20), p. 053015, 2018

DOI: 10.1088/1367-2630/aabe3d

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Time Evolution of Quantum Entanglement of an EPR Pair in a Localized Environment

Journal article published in 2017 by Jia Wang ORCID, Xia-Ji Liu, Hui Hu
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The Einstein-Podolsky-Rosen (EPR) pair of qubits plays a critical role in many quantum protocol applications such as quantum communication and quantum teleportation. Due to interaction with the environment, an EPR pair might lose its entanglement and can no longer serve as useful quantum resources. On the other hand, it has been suggested that introducing disorder into environment might help to prevent thermalization and improve the preservation of entanglement. Here, we theoretically investigate the time evolution of quantum entanglement of an EPR pair in a random-field XXZ spin chain model in the Anderson localized (AL) and many-body localized (MBL) phase. We find that the entanglement between the qubits decreases and approaches to a plateau in the AL phase, but shows a power-law decrease after some critical time determined by the interaction strength in the MBL phase. Our findings, on one hand, shed lights on applying AL/MBL to improve quantum information storage; on the other hand, can be used as a practical indicator to distinguish the AL and MBL phase.