Global correlation and local information flows in controllable non-Markovian open quantum dynamics

• DOI: 10.1038/s41534-022-00537-z
• Publication Date: 2022-03-03T11:05:35Z
• Authors: Xin-Yu Chen; Na-Na Zhang; Wan-Ting He; Xiang-Yu Kong; Ming-Jie Tao; Fu-Guo Deng; Qing Ai; Gui-Lu Long
• Keywords: Chemical Physics (physics.chem-ph); Quantum Physics; Statistical Mechanics (cond-mat.stat-mech); Physics; QC1-999; FOS: Physical sciences; QA75.5-76.95; 01 natural sciences; Electronic computers. Computer science; Physics - Chemical Physics; 0103 physical sciences; Quantum Physics (quant-ph); Condensed Matter - Statistical Mechanics; Physics - Optics; Optics (physics.optics)

AbstractIn 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.