Abstract
We investigate the quantum dynamics of a two-photon micromaser pumpedby atoms injected in the superposition state of the upper andintermediate levels. We simulate a master equation governing the systemby the Monte Carlo wavefunction approach and analyse the steady-statebehaviour as a function of the atomic transit time. The atomiccoherence can effectively enhance the intensity and sub-Poissonian ofthe cavity field as compared with the atomic mixture. It is alsodiscovered that the phase of the cavity field can be shifted byadjusting the detuning between the atom and field. This result showsthat it is possible to manipulate the phase of the cavity field bydetuning, due to atomic coherence.
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