An Optical Receiver Overcome the Standard Quantum Limit

Tsuyoshi SASAKI  Osamu HIROTA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E75-B   No.6   pp.514-520
Publication Date: 1992/06/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Communication Theory)
Category: 
Keyword: 
optical communication,  quantum communication,  received quantum state control,  conditional unitary and injection locking,  

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Summary: 
A study on the limitation of optical communication systems has received much attention. A method to overcome the standard quantum limit is to apply non-standard quantum state, especially squeezed state. However, the advantage of the non-standard quantum state is degraded by the transmission energy loss. To cope with this problem, we have proposed a concept of the received quantum state control (RQSC), but the realization has some difficulties. In this paper, we propose a new system to realize the received quantum state control system, employing injection locked laser (ILL) system. Then we show that our new system can overcome the standard quantum limit.