Quantum correlations dynamics of three-qubit states coupled to an XY spin chain: Role of coupling strengths |
| |
Affiliation: | 1. Department of Physics, Harbin Institute of Technology, Harbin 150001, China;2. Department of Physics, Harbin University, Harbin 150086, China;3. China Mobile Group, Heilongjiang CO. Ltd., Harbin 150001, China |
| |
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 |
本文献已被 CNKI 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|