Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.210401
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Funding
- Academy of Finland [115982, 115682]
- Magnus Ehrnrooth Foundation.
- Academy of Finland (AKA) [115682, 115982, 115682, 115982] Funding Source: Academy of Finland (AKA)
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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.
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