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- Title
Global correlation and local information flows in controllable non-Markovian open quantum dynamics.
- Authors
Chen, Xin-Yu; Zhang, Na-Na; He, Wan-Ting; Kong, Xiang-Yu; Tao, Ming-Jie; Deng, Fu-Guo; Ai, Qing; Long, Gui-Lu
- Abstract
In a fully-controllable experiment platform for studying non-Markovian open quantum dynamics, we show that the non-Markovianity could be investigated from the global and local aspects. By mixing random unitary dynamics, we demonstrate non-Markovian and Markovian open quantum dynamics. From the global point of view, by tuning the base frequency we demonstrate the transition from the Markovianity to the non-Markovianity as measured by the quantum mutual information (QMI). In a Markovian open quantum process, the QMI decays monotonically, while it may rise temporarily in a non-Markovian process. However, under some circumstances, it is not sufficient to globally investigate the non-Markovianity of the open quantum dynamics. As an essential supplement, we further utilize the quantum Fisher information (QFI) flow to locally characterize the non-Markovianity in different channels. We demonstrate that the QMI in combination with the QFI flow are capable of measuring the non-Markovianity for a multi-channel open quantum dynamics.
- Subjects
QUANTUM theory
- Publication
NPJ Quantum Information, 2022, Vol 8, Issue 1, p1
- ISSN
2056-6387
- Publication type
Article
- DOI
10.1038/s41534-022-00537-z