利用有限控制重构开放量子系统动力学
Reconstructing open quantum system dynamics with limited control
摘要：
如果实验者对感兴趣的系统具有完全的控制，则开放量子系统的动力学可以被完全描述和断层重建。大多数真实世界的实验不满足这一假设，控制量受到实验设置的限制。也就是说，系统的可执行操纵的集合是有限的。例如，想象一个很容易进行幺正操作的设置，但在实验结束时只允许一次测量。在本文中，我们提供了一个通用的重建方案，产生操作定义明确的动态任何可能的实验情况。如果一个额外的操作可以执行，这些“限制”的动态允许构建证人的初始相关性和记忆效应的存在。我们证明了我们的框架的适用性的两个重要的情况下，一组可执行的操作只包括酉操作或投影测量，分别，并表明它提供了一个强大的工具，用于描述量子控制实验。
英文摘要：
The dynamics of an open quantum system can be fully described and tomographically reconstructed if the experimenter has complete control over the system of interest. Most real-world experiments do not fulfill this assumption, and the amount of control is restricted by the experimental set-up. That is, the set of performable manipulations of the system is limited. For instance, imagine a set-up where unitary operations are easy to make, but only one measurement at the end of the experiment is allowed. In this paper, we provide a general reconstruction scheme that yields operationally well-defined dynamics for any conceivable kind of experimental situation. If one additional operation can be performed, these `restricted' dynamics allow for the construction of witnesses for initial correlations and the presence of memory effects. We demonstrate the applicability of our framework for the the two important cases where the set of performable operations comprises only unitary operations or projective measurements, respectively, and show that it provides a powerful tool for the description of quantum control experiments.
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