Bath-state (In)dependence of Non-Markovianity Measures in Quadratic Open Systems

Abstract

Open quantum system dynamics fail to fulfill the conditions of the Markov approximation when the environment and system timescales are close to each other. Such behavior of these systems can be characterized by several non-Markovianity measures, which are expected to vary with the environment parameters. In this work, we consider a fermionic quadratic open quantum system, establishing bath-state independence of the Breuer--Laine--Piilo and the Lorenzo--Plastina--Paternostro non-Markovianity measures. However, our analytical results reveal that the entanglement-based and divisibility-based Rivas--Huelga--Plenio measures, as well as the entropic Megier--Smirne--Vacchini measure, remain sensitive to the reservoir state, through both its temperature and its chemical potential. Modeling the reservoir as a free-fermionic chain, we derive an exact time-local master equation for a single fermionic site in contact with it. Our numerical results for this model confirm these findings and show that the BLP and LPP measures vanish identically only on the bound-state threshold, where the bath-sensitive measures nevertheless remain finite.