HD-QKD system based on polarization modulation time coding

A technology of polarization modulation and time coding, applied in transmission systems, digital transmission systems, and key distribution, which can solve the problems of positive correlation between complexity and dimension, constraints on high-dimensional time coding QKD systems, and increased complexity of X-based vector measurement devices , to achieve the effect of improving measurement efficiency
CN108540282APending Publication Date: 2018-09-14RUBAN QUANTUM TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
RUBAN QUANTUM TECH CO LTD
Publication Date
2018-09-14

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Abstract

The invention discloses an HD-QKD system based on polarization modulation time coding, comprising: the transmitting end generates a polarization modulated optical pulse group based on light injection,then obtains a coded optical pulse group via a base vector modulation and a decoy state modulation, and sends the encoded optical pulse group to the receiving end after being attenuated; and the receiving end respectively uses the Z-based vector detecting module and the X-based vector detecting module to perform detection after splitting the coded optical pulse group from the transmitting end. The HD-QKD system provided by the invention adopts polarization modulation time coding and corresponding measuring devices, and further improves the measurement efficiency.
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Description

technical field

[0001] The invention relates to the technical field of quantum communication, in particular to a high-dimensional quantum key distribution system based on polarization modulation time coding. Background technique

[0002] With the development of quantum information theory and technology, quantum computers will be available soon. Traditional public key systems based on computational complexity will no longer be secure. People have known for a long time that symmetric encryption is used, and the one-time pad encryption system is safe from the perspective of information theory. This kind of security is not based on similar premises such as computational complexity, so it will not be affected by quantum computers. But this kind of symmetric encryption system needs to carry out secure real-time long-distance key distribution, which is difficult to do in the classical system. The emergence of quantum key distribution system (QKD) solves the security problem in th...

Claims

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