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Four-way coaxial free space quantum communication coding device

A free space, quantum communication technology, applied in photon quantum communication, free space transmission, electromagnetic wave transmission system and other directions, can solve difficulties and other problems, achieve the effect of high coaxiality, good stability, and ensure security

Active Publication Date: 2017-09-08
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitations of optical fiber materials, the loss and decoherence effects of optical fibers cannot be avoided. At present, the performance of low-loss optical fibers has approached the theoretical limit. It has become very difficult to use optical fibers to establish quantum channels at two points more than 100 kilometers apart.

Method used

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  • Four-way coaxial free space quantum communication coding device
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  • Four-way coaxial free space quantum communication coding device

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Embodiment Construction

[0019] The present invention adopts following main devices:

[0020] 1. BB84 polarization encoding module 1: the first polarization maintaining fiber with LD 1-1-1, the second polarization maintaining fiber with LD 1-1-2, the third polarization maintaining fiber with LD 1-2-1 and The fourth polarization-maintaining fiber 1-2-2 with LD adopts LP852-SF30, and the fiber core diameter is 5.3um; the first Wollaston prism 1-1 and the second Wollaston prism 1-2 use calcite material, and the The extinction ratio is better than 100000:1; the depolarization BS1-3 adopts the device of Thorlabs company model BS008, which uses a wavelength range of 770-1100nm, and the aperture is 5mm; the collimator lens 1-4 adopts the device of Thorlabs company model 352150, and the focal length 2mm, PIN tube 1-5 adopts the device of Thorlabs company model number 1110576, and the wavelength range is 600-1100nm. Component integration can be integrated by Shenzhen Guangyue Technology;

[0021] 2. Beam cou...

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Abstract

The invention discloses a four-way coaxial free space quantum communication coding device. According to the device, four-way coding signals are coupled to a single mode fiber for transmission, so high-precision coaxiality of four-way quantum light is ensured; moreover, through utilization of the polarization property that the single mode fiber has unitary transformation, the polarization transformation introduced into the fiber is compensated through adoption of a 1 / 4, 1 / 4 and 1 / 2 wave plate combination scheme, so a polarization state of emergent light is ensured; and the polarization compensation is monitored through utilization of a BB84 decoding module, thereby ensuring a polarization compensation effect. The device is characterized by high coaxiality, high stability and high confidentiality. The device is applicable to urgent demands for miniaturization, high polarization-maintenance and high reliability of the coding module in space quantum communication.

Description

technical field [0001] The invention discloses a free-space quantum communication encoding device with high coaxiality, which is especially suitable for a free-space quantum communication system based on polarization encoding, and also suitable for a free-space optical communication system based on polarization encoding. Background technique [0002] Secure communication is a transmission method that allows both parties to communicate to exchange information in a top-secret state. Many countries attach great importance to the research of secure communication. The research of quantum communication technology is closely related to the major needs of national security. It is expected to greatly improve the security of information transmission, the capacity and efficiency of information transmission channels, etc. It is an important strategic direction for the development of information technology in the future, and it is very likely to cause many scientific Revolutions in the f...

Claims

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Application Information

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IPC IPC(8): H04B10/11H04B10/70H04B10/532H04J14/06
CPCH04B10/11H04B10/532H04B10/70H04J14/06Y02D30/70
Inventor 吴金才何志平王天洪舒嵘王建宇
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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