Entanglement protection and generation under continuous monitoring

TL;DR

This paper demonstrates that continuous monitoring of the environment can preserve or generate entanglement between two non-interacting qubits, even when dissipation would normally destroy it, highlighting a method for entanglement control.

Contribution

It introduces a novel approach showing how environmental monitoring can protect or create entanglement in simple quantum systems without direct interaction.

Findings

Monitoring can preserve entanglement despite dissipation

Monitoring can generate entanglement where none existed

Examples of entanglement birth, death, and rebirth due to monitoring

Abstract

Entanglement between two quantum systems is a resource in quantum information, but dissipation usually destroys it. In this article we consider two qubits without direct interaction and we show that, even in cases where the open system dynamics destroys any initial entanglement, the mere monitoring of the environment can preserve or create the entanglement, by filtering the state of the qubits. While the systems we study are very simple, we can show examples with entanglement protection or entanglement birth, death, rebirth due to monitoring.