Quantum key distribution network system and method based on orbital angular momentum multiplexing

A technology of quantum key distribution and orbital angular momentum, which is applied to key distribution, can solve problems such as low separation efficiency, difficulty in separating quantum-level single photon orbital angular momentum, and restrictions on the application of OAM photon states.
CN107634831AActive Publication Date: 2018-01-26NAT QUANTUM COMM GUANGDONG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NAT QUANTUM COMM GUANGDONG CO LTD
Publication Date
2018-01-26

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Abstract

The invention discloses a quantum key distribution network system and method based on orbital angular momentum multiplexing. The system comprises an Alice control side, an orbital angular momentum mode division multiplexing unit and a Bob user side. The Alice control side comprises a signal modulation unit and an orbital angular momentum multiplexing unit. The orbital angular momentum mode division multiplexing unit comprises a Galileo telescope assembly and an orbital angular momentum separation device. The Bob user side comprises N Bob users. Each Bob user comprises a polarization controllerand a detection device. A light signal generated by the signal modulation unit enters the orbital angular momentum multiplexing unit, the Galileo telescope assembly and the orbital angular momentum separation device in sequence, then is transmitted to the polarization controller of the corresponding Bob user side and finally enters the detection device for detection. According to the system and method, one-to-many communication of quantum network communication is realized, each user is relatively independent, the number of the users can be increased as the orbital angular momentum multiplexing is increased, and the system and the method have high expandability and relatively high practicability.
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Description

technical field

[0001] The present invention relates to the field of free space communication and multi-user quantum communication network, in particular to a quantum key distribution network system and method based on orbital angular momentum multiplexing Background technique

[0002] Quantum key distribution is the fastest-growing and most mature technology in quantum communication technology, and it has become the pioneer of practical quantum communication because of its communication security. With the deepening of research, the difficulties of quantum key distribution technology have been continuously broken through, and quantum key distribution has the prospect of large-scale application. However, in order to realize a global quantum key distribution network, it is necessary to break through the limitation of distance.

[0003] At present, due to the limitations of optical fiber loss and the imperfection of detectors, the distance of quantum key distribution using opt...

Claims

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