Quantum correlations dynamics of three-qubit states coupled to an XY spin chain:Role of coupling strengths

doi:10.1088/1674-1056/26/10/100501

Abstract We investigate the prominent impacts of coupling strengths on the evolution of entanglement and quantum discord for a three-qubit system coupled to an XY spin-chain environment. In the case of a pure W state, more robust, even larger nonzero quantum correlations can be obtained by tailoring the coupling strengths between the qubits and the environment. For a mixed state consisting of the GHZ and W states, the dynamics of entanglement and quantum discord can characterize the critical point of quantum phase transition. Remarkably, a large nonzero quantum discord is generally retained, while the nonzero entanglement can only be obtained as the system-environment coupling satisfies certain conditions. We also find that the impact of each qubit's coupling strength on the quantum correlation dynamics strongly depends on the variation schemes of the system-environment couplings.

Keywords: quantum phase transition quantum correlation tripartite system XY spin chain

Received: 20 March 2017
Revised: 09 June 2017
Accepted manuscript online:

PACS:	05.30.Rt	(Quantum phase transitions)
	03.65.Ud	(Entanglement and quantum nonlocality)
	03.65.Aa	(Quantum systems with finite Hilbert space)
	75.10.Pq	(Spin chain models)

Fund: Project supported by National Basic Research Program of China (Grant No. 2013CBA01702) and National Natural Science Foundation of China (Grant Nos. 61377016, 61575055, 10974039, 61307072, 61308017, and 61405056).

Corresponding Authors: Shu-Tian Liu
E-mail: stliu@hit.edu.cn

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Shao-Ying Yin(尹少英), Qing-Xin Liu(刘庆欣), Jie Song(宋杰), Xue-Xin Xu(许学新), Ke-Ya Zhou(周可雅), Shu-Tian Liu(刘树田) Quantum correlations dynamics of three-qubit states coupled to an XY spin chain:Role of coupling strengths 2017 Chin. Phys. B 26 100501

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Quantum correlations dynamics of three-qubit states coupled to an XY spin chain:Role of coupling strengths

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