Entangled entanglement in Raman lasers
Department of Physics, Huazhong Normal University,
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Received in final form: 24 June 2010
Published online: 4 February 2011
We show that entangled entanglement can be obtained from a multimode Raman laser. In this system, all lasing modes constitute a quantum-beat. Equivalently, one collective mode is operated well above threshold and exhibits the sub-Poissonian statistics, while other orthonormal collective modes are excluded from the interacting system and stay in vacuum states. This determines entanglement between any two sub-collections, in each of which exists entanglement between any two sub-sub-collections, and so on, if present. This scheme is accessible based on the recent experimental progress in Raman lasers.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011