Degradation of Entanglement in Markovian Noise

TL;DR

This paper investigates how local Markovian noise affects the duration of entanglement in quantum systems, revealing non-monotonic behaviors and sudden death phenomena influenced by the interplay of coherent and dissipative effects.

Contribution

It introduces the concept of entanglement survival time under Markovian noise and analyzes how it is impacted by the dynamical generator's components, uncovering unexpected non-monotonic effects.

Findings

Entanglement can abruptly vanish due to non-monotonic dynamics.

Coherent and dissipative effects interplay causes sudden death of entanglement.

Entanglement survival time can be finite even in models that otherwise sustain it indefinitely.

Abstract

The entanglement survival time is defined as the maximum time a system which is evolving under the action of local Markovian, homogenous in time noise, is capable to preserve the entanglement it had at the beginning of the temporal evolution. In this paper we study how this quantity is affected by the interplay between the coherent preserving and dissipative contributions of the corresponding dynamical generator. We report the presence of a counterintuitive, non-monotonic behaviour in such functional, capable of inducing sudden death of entanglement in models which, in the absence of unitary driving are capable to sustain entanglement for arbitrarily long times.