Abstract
Abstract In this paper, we analyse the properties of a quantum state transformation system consisting of a squeezer and an optical Kerr medium. An average, a variance, and a signal-to-noise ratio (SNR) of a quadrature-phase amplitude are calculated analytically. We show that the SNR is increased by this system; in particular the use of a squeezer with a large squeezing gain gives a drastic improvement in the SNR. Furthermore, the reason for the improvement in SNR and the usefulness of the squeezed state are discussed.
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