控制开放超导量子电路系统中的几何量子关联冻结和量子相干性

Control of the frozen geometric quantum correlation and quantum coherence in dissipative superconducting quantum circuit

摘要:

本文研究了开放超导量子电路系统中，含时电磁场对两超导量子比特间的几何量子关联和量子相干性的影响. 我们发现，加入磁场之后，几何量子关联被冻结的现象会出现，并且冻结的时间会随着含时电磁场的加入而得到延长. 利用迹距离的方法，我们探讨了含时电磁场对超导量子比特与环境之间量子信息流动的影响，我们发现含时电磁场可以抑制环境的影响，降低超导量子比特与环境之间的量子信息流动.

Abstract:

We investigate the influence of time-dependent electromagnetic field on the geometric quantum correlation and quantum coherence between two superconducting qubits in an open superconducting quantum circuit system. It is shown that the freezing of geometric quantum correlation will occur after the addition of magnetic field, and the freezing time will be extended with the addition of time-dependent electromagnetic field. In addition, the influence of time-dependent electromagnetic field on the quantum information flow between superconducting qubits and the environment is discussed by using trace distance method. It is found that the time-dependent electromagnetic fields can suppress the effect of the environment and slow down the exchange of the quantum information flows between the superconducting qubits and the environment.