arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1210.8288quant-ph
收藏

初关联在精确可解退相模型中的动力学作用

The dynamical role of initial correlation in the exactly solvable dephasing model

Yang Gao

摘要:

在精确可解的纯退相模型中,研究了初始关联对开放系统动力学的影响。我们发现初始关联的作用通过相位函数和权重因子发挥作用,这将在时间演化过程中执行振荡,并发现耦合到玻色子浴的量子比特的退相干在短时间内相对于自旋浴更增强。我们还证明了一个量子比特的两个态之间的迹距离可以增加到超过它的初始值,并且初始关联可以为两个量子比特的纠缠的阻尼振荡和恢复提供另一个资源。最后,我们研究了在bang-bang脉冲控制下,退相干从动力学增强到动力学抑制的交叉对初始相关和浴组分统计的依赖性。

英文摘要:

We investigate the effects of the initial correlation on the dynamics of open system in the exactly solvable pure dephasing model. We show that the role of the initial correlation come into play through a phase function and a weight factor, which would perform oscillations during time evolution, and find that the decoherence of a qubit coupled to a boson bath is more enhanced with respect to a spin bath in the short time. We also demonstrate that the trace distance between two states of a qubit can increase above its initial value, and that the initial correlation can provide another resource for the damply oscillation and revival of the entanglement of two qubits. We finally investigate the dependence of the crossover of decoherence from the dynamical enhancement to suppression under the bang-bang pulse control on the initial correlation and the statistics of the bath constituents.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑