A scheme for preparation of coherent superposition of Fock states ofelectromagnetic field is constructed. The superposition state is created insidethe cavity via a strong interaction of a four-level atom with quantum field ofthe cavity and classic laser fields. We demonstrate the possibility to createdesired arbitrary superposition of the cavity Fock states just by changing therelative delay of the fields. Then, as another application of our model, westudy a means of creating entanglement of neutral four-level atoms usingdifferent sequences of interactions with the cavity and laser fields.
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