Steady State Entanglement in Cavity QED

Details Steady State Entanglement in Cavity QED Steady State Entanglement in Cavity QED

2006-01-31

arxiv.org/abs/quant-ph/0601208v4

Optics Express, Vol. 14, Issue 10, pp. 4514-4524 (May 2006)

Physics

Quantum Physics

enhanced discussion, corrected formulas, title change, 1 added figure

Scientific paper

10.1364/OE.14.004514

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.

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