论文标题
在开放的两分系统中分发记忆效果
Distributing Memory Effects in an Open Two-Qubit System
论文作者
论文摘要
我们介绍了一种方法，可以在开放的双Qubit系统状态空间的不同子空间之间分布内存效应。在线性光学框架中，我们感兴趣的系统是两个光子的极化，而环境则由它们的自由度组成。通过利用最初相关的频率分布和初始频率依赖性相位因素，我们能够控制所有四个变形函数以进行极化 - 对应于不同的开放系统子空间划分 - 几乎彼此独立。因此，我们的结果表明，在多部分的dephasing系统中，马尔可夫和非马克维亚动力学如何在子系统之间任意分配，并产生新颖的记忆分区概念。我们还讨论了进一步的含义，例如，结果对两量Qubit系统内的纯度和熵的动力学有所了解。
We introduce a method to distribute memory effects among different subspaces of an open two-qubit system's state space. Within the linear optical framework, our system of interest is the polarization of two photons, while the environment consists of their frequency degree of freedom. By exploiting initially correlated frequency distributions and initial frequency-dependent phase factors, we are able to control all the four decoherence functions for polarization -- corresponding to different open system subspace divisions -- almost independently of each other. Hence, our results demonstrate how, in a multipartite dephasing system, Markovian and non-Markovian dynamics can be arbitrarily divided between the subsystems, and giving rise to a novel concept of memory partitions. We also discuss further implications the results have, e.g., on the dynamics of purity and entropy within the two-qubit system.
