Abstract
The effect on a simple two-level atom of an electromagnetic field having an arbitrary distribution of photon occupation numbers is considered. It is shown that atomic energy levels shift of the order of magnitude of the Bloch-Siegert shift can be produced by interference between different states of the field. The interference term is similar to a phase term which appears in the calculation of the classical Bloch-Siegert shift. It is predicted that in general this term will average to zero, thus permitting interference effects between states of the field to be neglected.
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