Polarization controlling encoding method, encoder and quantum key dispatching system
A technology of quantum key distribution and polarization control, applied in the field of coding methods and devices in quantum key distribution, can solve the problems of reduced anti-interference ability, hidden safety hazards, not too long and too low interference frequency, and achieves environmental protection. The effect of reduced requirements, reduced speed requirements, improved practical stability
Active Publication Date: 2009-11-04
ANHUI QASKY QUANTUM SCI & TECH CO LTD
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The invention relates to a polarization controlling encoding method, an encoder and a quantum key dispatching system. The invention is characterized in that the interior of the encoder adopts a polarization-maintaining light path or a ninety-degree Faraday rotation reflector reflection to cause output optical pulse polarization state to be the same; the optical pulse output by the sending terminalof the quantum key dispatching system taking the polarization controlling encoder as the core is passed to the receiving terminal thereof by a quantum channel in a uni-directional way; according to the superposition interference results of the optical pulse and distributorship agreement of the quantum key, the quantum key dispatching is realized. The polarization controlling encoder causes the whole system (comprising a sending set, a reception unit and the quantum channel) to have the interference free capability. The outlet of the sending set and the inlet of the receiving set of the systemare added with a reversal photon separation detection unit, thus preventing the invasion of the modulation information and carrying the photon to get off the reception unit of Trojan photon. The quantum key dispatching system can realize unconditional secure assignment of the key.
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