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The Berry phase acquired by an electromagnetic field undergoing an adiabaticand cyclic evolution in phase space is a purely quantum-mechanical effect ofthe field. However, this phase is usually accompanied by a dynamicalcontribution and cannot be manifested in any light-beam interference experimentbecause it is independent of the field state. We here show that such a phasecan be produced using an atom coupled to a quantized field and driven by aslowly changing classical field, and it is manifested in atomic Ramseyinterference oscillations. We also show how this effect may be applied toone-step implementation of multiqubit geometric phase gates, which isimpossible by previous geometric methods. The effects of dissipation andfluctuations in the parameters of the pump field on the Berry phase andvisibility of the Ramsey interference fringes are analyzed.

Manifestation of a nonclassical Berry phase of an electromagnetic field in atomic Ramsey interference