Physikalisches Institut, Universität Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany.
Phys Rev Lett. 2009 Nov 20;103(21):210401. doi: 10.1103/PhysRevLett.103.210401. Epub 2009 Nov 16.
We construct a general measure for the degree of non-Markovian behavior in open quantum systems. This measure is based on the trace distance which quantifies the distinguishability of quantum states. It represents a functional of the dynamical map describing the time evolution of physical states, and can be interpreted in terms of the information flow between the open system and its environment. The measure takes on nonzero values whenever there is a flow of information from the environment back to the open system, which is the key feature of non-Markovian dynamics.
我们构建了一个用于衡量开放量子系统中非马尔可夫行为程度的通用度量。这个度量基于迹距离，它量化了量子态的可区分性。它是描述物理态随时间演化的动力学映射的函数，可以根据开放系统与其环境之间的信息流来解释。只要有信息从环境流向开放系统，这个度量就会取非零值，这是非马尔可夫动力学的关键特征。
