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An Optical Receiver Overcome the Standard Quantum Limit
Tsuyoshi SASAKI Osamu HIROTA
IEICE TRANSACTIONS on Communications
Publication Date: 1992/06/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Communication Theory)
optical communication, quantum communication, received quantum state control, conditional unitary and injection locking,
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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.