Quantum entanglement dynamics based oncomposite quantum collision model

doi:10.1088/1674-1056/ab84d0

Abstract

By means of composite quantum collision models, we study the entanglement dynamics of a bipartite system, i.e., two qubits S₁ and S₂ interacting directly with an intermediate auxiliary qubit S_A, while S_A is in turn coupled to a thermal reservoir. We are concerned with how the intracollisions of the reservoir qubits influence the entanglement dynamics. We show that even if the system is initially in the separated state, their entanglement can be generated due to the interaction between the qubits. In the long-time limit, the steady-state entanglement can be generated depending on the initial state of S₁ and S₂ and the environment temperature. We also study the dynamics of tripartite entanglement of the three qubits S₁, S₂, and S_A when they are initially prepared in the GHZ state and separated state, respectively. For the GHZ initial state, the tripartite entanglement can be maintained for a long time when the collision strength between the environment qubits is sufficiently large.

Keywords: entanglement dynamics steady-state entanglement collision model

Received: 06 January 2020
Revised: 05 March 2020
Accepted manuscript online:

PACS:	03.65.Ud	(Entanglement and quantum nonlocality)
	03.65.Yz	(Decoherence; open systems; quantum statistical methods)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 61675115 and 11974209), the Taishan Scholar Project of Shandong Province of China (Grant No. tsqn201812059), and the Shandong Provincial Natural Science Foundation of China (Grant No. ZR2016JL005).

Corresponding Authors: Yun-Jie Xia, Zhong-Xiao Man
E-mail: yjxia@qfnu.edu.cn;zxman@qfnu.edu.cn

Cite this article:

Xiao-Ming Li(李晓明), Yong-Xu Chen(陈勇旭), Yun-Jie Xia(夏云杰), Qi Zhang(张琦), Zhong-Xiao Man(满忠晓) Quantum entanglement dynamics based oncomposite quantum collision model 2020 Chin. Phys. B 29 060302

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