The European Physical Journal D

, Volume 49, Issue 2, pp 257–264 | Cite as

Exact results on decoherence and entanglement in a system of N driven atoms and a dissipative cavity mode

  • M. Bina
  • F. CasagrandeEmail author
  • A. Lulli


We solve the dynamics of an open quantum system where N strongly driven two-level atoms are equally coupled on resonance to a dissipative cavity mode. Analytical results are derived on decoherence, entanglement, purity, atomic correlations and cavity field mean photon number. We predict decoherencefree subspaces for the whole system and the N-qubit subsystem, the monitoring of quantum coherence and purity decay by atomic populations measurements, the conditional generation of atomic multi-partite entangled states and of cavity cat-like states. We show that the dynamics of atoms prepared in states invariant under permutation of any two components remains restricted within the subspace spanned by the completely symmetric Dicke states. We discuss examples and applications in the cases N = 3, 4.


42.50.Pq Cavity quantum electrodynamics; micromasers 03.65.Yz Decoherence; open systems; quantum statistical methods 03.67.Bg Entanglement production and manipulation 


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© Springer 2008

Authors and Affiliations

  1. 1.Dipartimento di FisicaUniversità di MilanoMilanoItaly

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