Sudden death and birth of entanglement beyond the Markovian approximation

TL;DR

This paper explores how entanglement between two qubits evolves when interacting with non-Markovian reservoirs, revealing phenomena like entanglement sudden birth and revival that differ from Markovian cases.

Contribution

It demonstrates the occurrence of entanglement sudden birth without symmetry to entanglement sudden death in a non-Markovian setting, providing a new phenomenological interpretation.

Findings

Entanglement sudden birth occurs without symmetry to entanglement sudden death.

Entanglement revival is observed beyond the Markovian approximation.

Different entanglement dynamics compared to Markovian reservoirs.

Abstract

We investigate the entanglement dynamics of two initially entangled qubits interacting independently with two uncorrelated reservoirs beyond the Markovian approximation. Quite different from the Markovian reservoirs [C. E. Lopez et al., Phys. Rev. Lett. 101 (2008) 080503], we find that entanglement sudden birth (ESB) of the two reservoirs occurs without certain symmetry with respect to the entanglement sudden death (ESD) of the two qubits. A phenomenological interpretation of entanglement revival is also given.