Three qubits in a symmetric environment: dissipatively generated asymptotic entanglement

TL;DR

This paper investigates how three identical qubits in a symmetric environment can generate more entanglement asymptotically through a process involving an auxiliary depolarized qubit, surpassing direct two-qubit immersion.

Contribution

It introduces a novel method of entanglement enhancement by adding and removing a depolarized qubit in a symmetric environment, demonstrating a new pathway for entanglement generation.

Findings

Adding a depolarized qubit increases asymptotic entanglement.

The process surpasses direct two-qubit immersion in entanglement.

Asymptotic states can be engineered for better entanglement outcomes.

Abstract

We study the asymptotic entanglement of three identical qubits under the action of a Markovian open system dynamics that does not distinguish them. We show that by adding a completely depolarized qubit to a special class of two qubit states, by letting them reach the asymptotic state and by finally eliminating the added qubit, can provide more entanglement than by direct immersion of the two qubits within the same environment.