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A Realization of Optical Communication Using Received Quantum State Control
Seitetsu BUN Tsuyoshi SASAKI Hideaki TSUSHIMA Osamu HIROTA Masao NAKAGAWA
IEICE TRANSACTIONS (1976-1990)
Publication Date: 1990/10/25
Print ISSN: 0000-0000
Type of Manuscript: Special Section PAPER (Special Issue on Communication Theory and Its Applications)
Category: Modulation and Demodulation
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Optical communication systems using quantum state control have received much attentions. For this quantum state control communication, however, one of the most serious problems is the effect of transmission loss which degrades the advantage of the quantum state controlled signal. In optical long transmission communications, in general, transmission loss is large so that the advantage using quantum state controlled signal is hardly lost and performance of quantum state control communications is almost equal to that of conventional communications. So it is necessaty for a new application of quantum state control to overcome the standard quantum limitation which is achieved by the conventional coherent communication system. In this paper, we propose a realization of a new optical communication system with received quantum state controller, so called Received Quantum State Control (RQSC) system, in order to cope with transmission loss problem. This system can provide the advantage of quantum state control regardless of amount of transmission loss. Particularly, it is shown that the system can overcome the standard quantum limitation which corresponds to the limitation achieved by conventional BPSK homodyne system using coherent state signal. This corresponds to Quantum Receiver" of the broad sense in Helstrom's receiver theory.