Quantum Control of Two-Qubit Entanglement Dissipation

TL;DR

This paper explores quantum control techniques to mitigate entanglement loss in two-qubit systems caused by environmental decoherence, proposing a feedback control scheme that effectively preserves entanglement.

Contribution

It introduces a Wiseman-Milburn feedback control method that successfully counters entanglement dissipation, outperforming standard control approaches.

Findings

Standard control methods fail to prevent entanglement loss.

Feedback control scheme effectively negates environmental dissipation.

Proposes a practical approach for entanglement preservation in quantum systems.

Abstract

We investigate quantum control of the dissipation of entanglement under environmental decoherence. We show by means of a simple two-qubit model that standard control methods - coherent or open-loop control - will not in general prevent entanglement loss. However, we propose a control method utilising a Wiseman-Milburn feedback/measurement control scheme which will effectively negate environmental entanglement dissipation.