We study the properties of wave-packet states with vortex structure. In particular we present the characteristics of a two-mode radiation field characterized by a configuration-space wave function ψᵥ=(x-iy)ᵐe^-(x²+y²)/2σ². We show the generation of such states by the interaction of {Λ} systems with squeezed radiation in a two-mode cavity. The two modes are correlated due to entanglement, which also produces the mixed state of each mode even though the state of the two-mode field is a pure state.
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Agarwal et al. (1997) studied this question.
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