The　Berry　phase　acquired　by　an　electromagnetic　field　undergoing　an　adiabatic　and　cyclic　evolution　in　phase　space　is　a　purely　quantum-mechanical　effect　of　the　field.　However,　this　phase　is　usually　accompanied　by　a　dynamical　contribution　and　cannot　be　manifested　in　any　light-beam　interference　experiment　because　it　is　independent　of　the　field　state.　We　here　show　that　such　a　phase　can　be　produced　using　an　atom　coupled　to　a　quantized　field　and　driven　by　a　slowly　changing　classical　field,　and　it　is　manifested　in　atomic　Ramsey　interference　oscillations.　We　also　show　how　this　effect　may　be　applied　to　one-step　implementation　of　multiqubit　geometric　phase　gates,　which　is　impossible　by　previous　geometric　methods.　The　effects　of　dissipation　and　fluctuations　in　the　parameters　of　the　pump　field　on　the　Berry　phase　and　visibility　of　the　Ramsey　interference　fringes　are　analyzed.