Steady State Entanglement in Cavity QED
摘要
We investigate steady state entanglement in an open quantum system, specifically a single atom in a driven optical cavity with cavity loss and spontaneous emission. The system reaches a steady pure state when driven very weakly. Under these conditions, there is an optimal value for atom-field coupling to maximize entanglement, as larger coupling favors a loss port due to the cavity enhanced spontaneous emission. We address ways to implement measurements of entanglement witnesses and find that normalized cross-correlation functions are indicators of the entanglement in the system. The magnitude of the equal time intensity-field cross correlation between the transmitted field of the cavity and the fluorescence intensity is proportional to the concurrence for weak driving fields.
引用
@article{arxiv.quant-ph/0601208,
title = {Steady State Entanglement in Cavity QED},
author = {P. R. Rice and J. Gea-Banacloche and M. L. Terraciano and D. L. Freimund and L. A. Orozco},
journal= {arXiv preprint arXiv:quant-ph/0601208},
year = {2009}
}
备注
enhanced discussion, corrected formulas, title change, 1 added figure