System-reservoir dynamics of quantum and classical correlations

TL;DR

This paper investigates how classical and quantum correlations evolve in a two-qubit system under various noise channels, revealing that decoherence can occur without entanglement and quantum correlations may vanish without transferring to the environment.

Contribution

It provides analytical and numerical insights into the system-reservoir dynamics of correlations, challenging common assumptions about entanglement transfer during decoherence.

Findings

Decoherence can occur without entanglement between system and environment.

Quantum correlations can be completely lost without being transferred to the environment.

Different noise channels exhibit distinct effects on correlations.

Abstract

We address the system-reservoir dynamics of classical and quantum correlations in the decoherence phenomenon, regarding a two qubit composite system interacting with two independent environments. The most common noise channels (amplitude damping, phase damping, bit flip, bit-phase flip, and phase flip) was studied. By analytical and numerical analysis we found that, contrary to what is usually stated in the literature, decoherence may occurs without entanglement between the system and the environment. We also found that, in some cases, the bipartite quantum correlation initially presented in the system is completely evaporated, it is not transferred to the environments.