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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.

Active Publication Date: 2018-01-26
NAT QUANTUM COMM GUANGDONG CO LTD
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Problems solved by technology

[0010] The above schemes either have very low separation efficiency, or destroy the original quantum state, and cannot realize cascading, and there is still great difficulty in separating the single photon orbital angular momentum at the quantum level. These shortcomings limit the OAM photon state in the orbital angular momentum complex Applications in Quantum Communications

Method used

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

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Embodiment Construction

[0072] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0073] Refer to attached figure 1 As shown, it is a Duff prism module structure, including a Duff prism 101 , a first 1 / 4 wave plate 102 and a first half wave plate 103 . The Duff prism module rotates the phase of the photon in the orbital angular momentum (OAM) state. The Duff prism acts as a 1 / 4 wave plate for the polarization state of the photon. The photon will change its polarization state when it passes through the Duff prism. A 1 / 4 wave must be added The polarization change is compensated by a half-wave plate, and then the polarization direction of the photon is kept consistent with the original through the half-wave plate. The action process of the Duff prism module on the photon polarization state can be described by the following process:

[0074] The 45-degree polarization state photon is transformed into:

[0075]

[0076] ...

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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.

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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Application Information

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IPC IPC(8): H04L9/08
Inventor 郭邦红曾涵宇
Owner NAT QUANTUM COMM GUANGDONG CO LTD
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