Journal of Modern Optics

Special Issue: Photons, Atoms and Qubits: On the occasion of the 60th Birthday of Sir Peter L. Knight FRS, Edited by Barry C. Sanders, Jon P. Marangos and Vladimir Buzek

Collective entangled dark states

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DOI:: 10.1080/09500340701391449

Hideomi Nihira^a^* & C. R. Stroud Jr^a

pages 2121-2127

Available online: 01 Dec 2010

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Abstract

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 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.