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Phys Rev Lett. 2009 Apr 10;102(14):143601. Epub 2009 Apr 6.

Collective lamb shift in single photon Dicke superradiance.

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1
Princeton University, Princeton, New Jersey 08544, USA.

Abstract

The collective Lamb shift and associated radiative decay of a large cloud of radius R containing N atoms uniformly excited by one photon of wavelength lambda is analyzed. It is shown that the time evolution of the symmetric state prepared by single photon absorption in the limit R>>lambda is similar to that encountered in the Dicke limit of small sample (R<<lambda) superradiance. The theory includes virtual (counterrotating) terms naturally and thus provides a simple calculation of the collective Lamb shift of a single Dicke state.

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