利用经典驱动场增大耗散超导比特系统的稳态量子相干性

Amplifying stationary quantum coherence in a dissipativesuperconducting qubit system by a classical driving field

本文在相位退相干的超导系统中,研究了经典驱动场对超到量子比特与数据总线之间量子纠缠和量子相干动力学的影响。发现在长时间的演化过程中,超导量子比特与数据总线之间会产生稳态量子纠缠和量子相干性,通过调节经典驱动场可以提高稳态量子纠缠和量子相干性。此外,利用迹距离的方法,本文还研究了经典驱动场对于超导系统与环境之间信息流动的影响。结果表明:当相互作用时间足够长时,超导系统与环境之间的迹距离会达到稳态值,而且稳态迹距离可以通过经典驱动场来进行控制。

In the presence of phase decoherence,the influence of the classical driving field on the dynamics of quantum entanglement and quantum coherence between a superconducting qubit and a data bus have been investigated.It is found that the stationary quantum entanglement and quantum coherence can arise in the superconducting qubit system for long time evolution.the amount of stationary quantum entanglement and quantum coherence can be enhanced by adjusting the classical driving field.Furthermore,how the classical driving field affect the quantum transfer of information between superconducting qubit system and environment has also been explored by a witness of the trace distance.It is shown that the trance distance betwee superconducting qubit system and environment can reach a steady value and stationary trace distance can be controlled by the classical driving field.