Collective entangled dark states
Hideomi Nihira and C. R. Stroud, Jr.
Journal of Modern Optics 54, 2121 (2007).
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We describe a type of collective entangled dark state which exists when a group of many-level
atoms interact simultaneously with both high-Q cavity modes and free space modes of the
electromagnetic field. As an example we describe a collection of atoms with a level structure
of the form of J = 1/2 -> J = 1/2 and show that there are states of this system in which the
atoms remain trapped in a collective coherent superposition of ground state levels in spite of
the presence of photons in resonant field modes. Efficient methods of generalization of these
results to other atomic level structures and cavity fields are described.
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Last modified 13 September 2006