Time evolution of quantum correlations in presence of state dependent bath

TL;DR

This paper investigates how initial system-bath correlations and qubit separation affect the evolution of quantum entanglement and coherence in open quantum systems, highlighting temperature-dependent effects and the role of collective baths.

Contribution

It provides new insights into the impact of initial correlations and qubit separation on quantum dynamics beyond the Born approximation, especially at high temperatures.

Findings

Initial correlations are negligible at low temperatures.

At high temperatures, initial correlations significantly influence quantum dynamics.

Qubit separation in a collective bath helps sustain entanglement and coherence.

Abstract

The emerging quantum technologies heavily rely on the understanding of dynamics in open quantum systems. In the Born approximation, the initial system-bath correlations are often neglected which can be violated in the strong coupling regimes and quantum state preparation. In order to understand the influence of initial system-bath correlations, we study the extent to which these initial correlations and the distance of separation between qubits influence the dynamics of quantum entanglement and coherence. It is shown that at low temperatures, the initial correlations have no role to play while at high temperatures, these correlations strongly influence the dynamics. Furthermore, we have shown that distance of separation between the qubits in presence of collective bath helps to maintain entanglement and coherence at long times.