Stabilising entanglement by quantum jump-based feedback

TL;DR

This paper demonstrates a feedback method based on quantum jump detection that stabilizes entangled states in quantum systems, effectively countering detection inefficiencies and spontaneous emission effects.

Contribution

Introduces a robust feedback strategy using quantum jump detection to generate and stabilize entangled steady states, insensitive to detection inefficiencies and control errors.

Findings

Successfully stabilizes high-entanglement states despite spontaneous emission.

Robust feedback method insensitive to detection inefficiencies.

Overcomes control Hamiltonian errors to maintain entanglement.

Abstract

We show that direct feedback based on quantum jump detection can be used to generate entangled steady states. We present a strategy that is insensitive to detection inefficiencies and robust against errors in the control Hamiltonian. This feedback procedure is also shown to overcome spontaneous emission effects by stabilising states with high degree of entanglement.