Entropic and trace distance based measures of non-Markovianity

Abstract

We analyze and compare different measures for the degree of non-Markovianity in the dynamics of open quantum systems. These measures are based on the distinguishability of quantum states which is quantified, on the one hand, by the trace distance or, more generally, by the trace norm of the Helstrom matrix, and, on the other hand, by entropic quantifiers: the Jensen-Shannon divergence, the Holevo or the quantum skew divergence. We explicitly construct a qubit dynamics for which the trace norm based non-Markovianity measure is nonzero, while all the entropic measures turn out to be zero. This leads to the surprising conclusion that the non-Markovianity measure which employs the trace norm of the Helstrom matrix is strictly stronger than all entropic non-Markovianity measures.

arXiv comment10 pages, 7 figures

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• Quantifying non-Markovianity via local quantum Fisher information
• Transmission distance in the space of quantum channels
• Comparison of Distances and Entropic Distinguishability Quantifiers for the Detection of Memory Effects
• Witnessing non-Markovianity by Quantum Quasi-Probability Distributions
• Interplay between Non-Markovianity of Noise and Dynamics in Quantum Systems
• Phase space measures of information flow in open systems: A quantum and classical perspective of non-Markovianity
• Divisibility of dynamical maps: Schrödinger vs. Heisenberg picture
• Memory Effects and Entanglement Dynamics of Finite time Acceleration
• Quantum speed limits based on Jensen-Shannon and Jeffreys divergences for general physical processes