Issue
EPL
Volume 78, Number 3, May 2007
Article Number 30003
Number of page(s) 5
Section General
DOI http://dx.doi.org/10.1209/0295-5075/78/30003
Published online 16 April 2007
EPL, 78 (2007) 30003
DOI: 10.1209/0295-5075/78/30003

Casimir-Polder potentials as entanglement probe

M. A. Cirone1, G. Compagno1, G. M. Palma2, R. Passante1 and F. Persico1

1  CNISM & Dipartimento di Scienze Fisiche ed Astronomiche, Università degli Studi di Palermo - via Archirafi 36, I-90123 Palermo, Italy
2  NEST - CNR (INFM) & Dipartimento di Scienze Fisiche ed Astronomiche, Università degli Studi di Palermo - via Archirafi 36, I-90123 Palermo, Italy


received 23 November 2006; accepted in final form 19 March 2007; published May 2007
published online 16 April 2007

Abstract
We have considered the interaction of a pair of spatially separated two-level atoms with the electromagnetic field in its vacuum state and we have analyzed the amount of entanglement induced between the two atoms by the nonlocal field fluctuations. This has allowed us to characterize the quantum nature of the nonlocal correlations of the electromagnetic field vacuum state as well as to link the induced quantum entanglement with Casimir-Polder potentials.

PACS
03.65.Ud - Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.).
03.67.Mn - Entanglement production, characterization, and manipulation.
42.50.Dv - Nonclassical states of the electromagnetic field, including entangled photon states; quantum state engineering and measurements.

© Europhysics Letters Association 2007