非马尔科夫环境下耦合超导量子系统纠缠演化的数值研究

Numerical Study of the Coupled Superconducting Quantum Entanglement Evolution in Non-Markovian Environment

基于耦合超导量子比特系统模型下,在非马尔科夫环境中利用共生纠缠的方法分析了耦合系统纠缠的产生及其动力学的演化。研究了不同初始纠缠态下的纠缠猝死(ESD)和纠缠再生(ESB)现象;主要分析了系统耦合强度、库的截止频率与系统的振荡频率间的比值、温度和约瑟夫森能级差对纠缠演化的影响。结果表明:系统纠缠取决于初始纠缠态和系统的耦合强度J,并且通过调节以上非马尔科夫环境的相干参数可以延长解纠缠时间来确保量子计算过程中的应用和量子信息的实现。

Based on the model of coupled superconducting quantum qubit systems,we analyze the entanglement generation and dynamics in non-Markovian regime by the concurrence method.We mainly analyze the effect of system coupling strength,ratio between the reservoir cutoff frequency and the system oscillator frequency,temperature and energy levels split of the superconducting circuit to the entanglement dynamics especially the phenomenon of entanglement sudden death(ESD) and sudden birth(ESB) with different initial states.It is shown that the concurrence is determined by the initial state and the coupling constant J of the system,the entanglement time can be prolonged by adjusting above coherence parameters in non-Markovian environment to ensure the achievement for the application in quantum computation and quantum information.