Non-Markovianity through Multipartite Correlation Measures

TL;DR

This paper introduces a quantum information-based approach to quantify non-Markovian memory effects in quantum systems using multipartite correlation measures, with practical illustrations on multi-qubit dynamics.

Contribution

It establishes conditions under which multipartite correlations can measure non-Markovianity, advancing understanding of quantum memory effects.

Findings

Multipartite correlations can quantify non-Markovianity.

Trace-distance correlations reveal memory effects in multi-qubit systems.

Conditions for using correlation measures as non-Markovianity indicators are provided.

Abstract

We provide a characterization of memory effects in non-Markovian system-bath interactions from a quantum information perspective. More specifically, we establish sufficient conditions for which generalized measures of multipartite quantum, classical, and total correlations can be used to quantify the degree of non-Markovianity of a local quantum decohering process. We illustrate our results by considering the dynamical behavior of the trace-distance correlations in multi-qubit systems under local dephasing and generalized amplitude damping.