Volume 70 Issue 10
May. 2021
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Song Yue, Li Jun-Qi, Liang Jiu-Qing. Dynamics of quantum correlation for three qubits in hierarchical environment[J]. JOURNAL OF MECHANICAL ENGINEERING, 2021, 70(10): 100301. doi: 10.7498/aps.70.20202133
Citation: Song Yue, Li Jun-Qi, Liang Jiu-Qing. Dynamics of quantum correlation for three qubits in hierarchical environment[J]. JOURNAL OF MECHANICAL ENGINEERING, 2021, 70(10): 100301. doi: 10.7498/aps.70.20202133

Dynamics of quantum correlation for three qubits in hierarchical environment

doi: 10.7498/aps.70.20202133
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  • Corresponding author: Li Jun-Qi, E-mail: ljqsxu@163.com
  • Received Date: 15 Dec 2020
  • Rev Recd Date: 09 Jan 2021
  • Available Online: 27 May 2021
  • Publish Date: 27 May 2021
  • Much attention has been paid to the dynamics of quantum correlation in an open quantum system coupled to a single-layered environment for a long time. However, the system can be influenced by the multilayer environment or hierarchical environment in realistic scenarios, which is attracting increasing interest at present. In this context, we explore in this paper the dynamics of quantum correlation for a quantum system consisting of three independent qubits, each being immersed in a single mode lossy cavity which is further connected to another cavity. The influences of cavity-cavity coupling strength Ω and the decay rate of cavity Γ1 on the measures of quantum correlation, including negativity, Bell non-locality as well as entanglement witness, are investigated in detail in a strong coupling regime and a weak coupling regime. It is shown that the phenomena of sudden death and sudden birth can happen to both Bell non-locality and entanglement witness. When the decay rate Γ1 = 0 is given, with the increase of Ω these measures eventually reach their stationary values over time after a short period of damping oscillations, in which these stationary values will become larger for the larger Ω. At the same time, the values or the survival times of quantum correlation considered by us in the weak coupling regime are better than in the strong coupling case. In addition, the non-zero Γ1 has a great negative effect on quantum correlation. Hence, in order to suppress the loss of quantum correlation better, the effective manipulation of quantum weak measurement and measurement reversal operator is considered further. Some interesting results are obtained.

     

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