We address ultracold N -atom degenerate cascade systems and show that stationary subradiant states, already observed in the semiclassical regime, also exist in a fully quantum regime and for a small number of atoms. We explicitly evaluate the amount of stationary entanglement for the two-atom configuration and show full inseparability for the three-atom case. We also show that a continuous variable description of the systems is not suitable to detect entanglement due to the non-Gaussianity of subradiant states.
Stationary entanglement in N-atom subradiant degenerate cascade systems / M. Borrelli, N.U.C. Piovella, M.G.A. Paris. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 83:1(2011), pp. 013621.013621.1-013621.013621.7. [10.1103/PhysRevA.83.013621]
Stationary entanglement in N-atom subradiant degenerate cascade systems
N.U.C. PiovellaSecondo
;M.G.A. ParisUltimo
2011
Abstract
We address ultracold N -atom degenerate cascade systems and show that stationary subradiant states, already observed in the semiclassical regime, also exist in a fully quantum regime and for a small number of atoms. We explicitly evaluate the amount of stationary entanglement for the two-atom configuration and show full inseparability for the three-atom case. We also show that a continuous variable description of the systems is not suitable to detect entanglement due to the non-Gaussianity of subradiant states.File | Dimensione | Formato | |
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