On the dynamics of maximum extractable entanglement for open systems

TL;DR

This paper investigates how the maximum entanglement that can be extracted from two-qubit systems evolves over time under different environmental interactions, revealing revival phenomena and partial recovery of entanglement.

Contribution

It introduces a method to determine maximum extractable entanglement using filtering operations and analyzes its dynamics across various bath configurations.

Findings

Revival of entanglement in common bath scenarios.

Partial recovery of initial entanglement in independent baths at zero temperature.

Maximum entanglement dynamics depend on bath type and initial states.

Abstract

In this work we study the dynamics of the maximum extractable entanglement for a system composed of two qubits interacting either with two independent thermal baths, a common thermal bath or a common squeezed bath. The states with maximum entanglement are found applying filtering operations which transform each state to a state in Bell diagonal form. We observe a revival of the maximum extractable entanglement for common baths. It is also shown that for some particular states in two independent baths at zero temperature, one can partially recover the initial entanglement at any time.