Non-Markovian dynamics of system-reservoir entanglement

TL;DR

This paper investigates the complex non-Markovian entanglement dynamics between two qubits and their reservoirs, revealing entanglement transfer mechanisms and proposing schemes for entanglement generation and distribution in cavity QED systems.

Contribution

It provides an exact analysis of non-Markovian entanglement dynamics and introduces protocols for entanglement transfer and state preparation without direct cavity interaction.

Findings

Entanglement can transfer from qubits to reservoirs over time.

A scheme to generate maximally entangled cavity fields without direct interaction.

Protocols for deterministic and probabilistic entanglement generation in cavity systems.

Abstract

Using an exact approach, we study the dynamics of entanglement between two qubits coupled to independent reservoirs and between the two, initially disentangled, reservoirs. We also describe the transfer of bipartite entanglement from the two-qubits to their respective reservoirs focussing on the case of two atoms inside two different leaky cavities with a specific attention to the role of the detuning. We present a scheme to prepare the cavity fields in a maximally entangled state, without direct interaction between the cavities, by exploiting the initial qubits entanglement. We discuss a deterministic protocol, working in the presence of cavity losses, for the generation of a W-state of one qubit and two cavity fields and we describe a probabilistic scheme to entangle one of the atoms with the reservoir (cavity field) of the other atom.