Quantum Fisher Information Flow in Non-Markovian Processes of Open Systems

Details Quantum Fisher Information Flow in Non-Markovian Processes of Open Systems Quantum Fisher Information Flow in Non-Markovian Processes of Open Systems

2009-12-03

arxiv.org/abs/0912.0587v5

Physical Review A 82, 042103 (2010)

Physics

Quantum Physics

Final version published on Physical Review A

Scientific paper

10.1103/PhysRevA.82.042103

We propose to use the quantum Fisher information in characterizing the information flow of open quantum systems. This information-theoretic approach provides a quantitative measure to statistically distinguish Markovian and non-Markovian processes. A basic relation between the QFI flow and non-Markovianity is unveiled for quantum dynamics of open systems. For a class of time-local master equations, the exactly-analytic solution shows that the non-Markovianity is characterized by additive information sub-flows in different non-Markovian channels.

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