Reservoir cross-over in entanglement dynamics

TL;DR

This paper investigates how spontaneous emission influences entanglement evolution between two qubits in a structured reservoir, revealing a transition from common to independent reservoir behaviors in different regimes.

Contribution

It provides a detailed analysis of the entanglement dynamics in the strong coupling regime, highlighting the cross-over between common and independent reservoirs.

Findings

Entanglement exhibits distinct dynamics depending on the decay parameter.

The study identifies conditions for the transition between reservoir types.

Spontaneous emission significantly affects entanglement preservation.

Abstract

We study the effects of spontaneous emission on the entanglement dynamics of two qubits interacting with a common Lorentzian structured reservoir. We assume that the qubits are initially prepared in a Bell-like state. We focus on the strong coupling regime and study the entanglement dynamics for different regions of the spontaneous emission decay parameter. This investigation allows us to explore the cross-over between common and independent reservoirs in entanglement dynamics.