Applications of the Jaynes-Cummings model for the detection of nonorthogonal quantum states

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Abstract
This paper presents two kinds of applications of the Jaynes-Cummings model to improve detection schemes for the binary phase-shift-keyed signals of the coherent states ‖α〉 and ‖-α〉. The first application raises the amount of exact retrodiction of a mixture made by choosing at random from ‖α〉 and ‖-α〉. The second application is concerned with realizing the optimum receiver to achieve a low decision error. Instead of optical detection, atomic level detection after mapping from them to two-level states of an atom will be proposed. © 1996 The American Physical Society.