On Classes of Novel Quantum State for Attenuation Process

Tomohiko UYEMATSU  Osamu HIROTA  Kohichi SAKANIWA  

IEICE TRANSACTIONS (1976-1990)   Vol.E70   No.4   pp.385-388
Publication Date: 1987/04/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: LETTER
Category: Optical Communication

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For optical digital communications with energy loss, it is shown that there is a state which achieves much superior bit error rate than the Glauber coherent state even if the signal to quantum noise ratio is the same. Moreover, the lower bound for bit error rate is obtained.