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We discuss the optical bistable behavior of a system of N Λ-type three-level atoms pumped by a coherent input field and coupled to a squeezed vacuum field by treating the optical bistability of such a system as an input-out problem. It is shown that bistability can be realized due to the squeezed vacuum input.
The state evolution of a system of two-mode optical fields interacting with a Kerr medium is investigated. It is discovered that at some special times the system evolves into a quantum superposition of a finite number of different macroscopically distinguishable two-mode coherent states, i.e., so-called two-mode Schrodinger-cat states. Especially the two-mode Yurke-Stoler state is achieved at half...
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