State preparation via quantum coherence and continuous measurement

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Abstract
The theory of continuous measurement is generalized so as to be applicable to a two-mode radiation field whose properties are monitored by using a Λ system with initial coherence between two ground states. The two-mode system is shown to offer the possibility of generating a number of new quantum states. Quantum statistics of the field following continuous measurements is calculated. Results for the phase distribution, quasiprobability distribution, and the photon-number distribution of the resulting field are also presented.