Eur. Phys. J. D 61, 523-529 (2011)
https://doi.org/10.1140/epjd/e2010-10442-2

Production of entanglement in Raman three-level systems using feedback

¹ Department of Quantum Science, Research School of Physics and Engineering, The Australian National University, 0200 ACT, Australia
² Australian Centre for Quantum-Atom Optics, Department of Quantum Science, Research School of Physics and Engineering, The Australian National University, 0200 ACT, Australia

Corresponding author: ^a Robin.Stevenson@anu.edu.au

Received: 6 August 2010
Revised: 5 November 2010
Published online: 14 January 2011

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.