Production of entanglement in Raman three-level systems using feedback

TL;DR

This paper investigates how jump-based feedback in a damped ion-cavity system with Raman transitions affects entanglement generation, highlighting limitations due to trap asymmetries but showing high concurrence can still be achieved.

Contribution

It provides a theoretical analysis of entanglement limits in Raman three-level systems with feedback, emphasizing the effects of trap asymmetries and spontaneous emission.

Findings

Fidelity limited by trap asymmetries

Concurrence remains above 0.88 in realistic conditions

Raman transitions reduce feedback bandwidth requirements

Abstract

We examine the theoretical limits of the generation of entanglement in a damped coupled ion-cavity system using jump-based feedback. Using Raman transitions to produce entanglement between ground states reduces the necessary feedback bandwidth, but does not improve the overall effect of the spontaneous emission on the final entanglement. We find that the fidelity of the resulting entanglement will be limited by the asymmetries produced by vibrations in the trap, but that the concurrence remains above 0.88 for realistic ion trap sizes.