Properties of Photon Distribution of Squeezed State in Loss Channel

Seitetsu BUN
Kazushige YONENAGA

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E74-A    No.9    pp.2586-2595
Publication Date: 1991/09/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Issue on Information Theory and Its Applications)

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In this paper, we analyze photon distributions of squeezed state from a viewpoint of quantum state control communications (QSCC). Especially, the effect of the channel loss on these properties are shown in transmitted quantum state control (TQSC). As a result, we show the general property of the photon distribution of squeezed state suffering the loss effect in channel with respect to the transparence efficiency. Although the photon distribution of squeezed state suffering the loss effect approaches the Poissonian one, the photon distribution on the way becomes a remarkable one in some region of a squeezing parameter. Then we show optimum conditions of squeezed state based on Signal to noise ratio (SNR) in the photon counting system. It is found that the degree of the squeezing to minimize error probability is much smaller than that for SNR. Moreover, we compare properties of the photon counting system using a squeezer as a preamplifier with those using a general linear optical amplifier.