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Polarization-maintaining large-range directional quantum communication optical device and method based on U-shaped optical path

A quantum communication, large-scale technology, applied in the field of polarization-maintaining, large-scale directional quantum communication optical devices, can solve difficult problems and other problems

Pending Publication Date: 2019-08-06
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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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.

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  • Polarization-maintaining large-range directional quantum communication optical device and method based on U-shaped optical path
  • Polarization-maintaining large-range directional quantum communication optical device and method based on U-shaped optical path
  • Polarization-maintaining large-range directional quantum communication optical device and method based on U-shaped optical path

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Embodiment Construction

[0017] The implementation examples of the method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] The main devices adopted in the present invention are described as follows:

[0019] 1. Coarse tracking camera 1: The tracking camera is composed of a converging lens and a CCD camera. The converging lens adopts a customized model, and its main performance parameters; lens processing parameter requirements: the surface RMS value of the light-transmitting surface is better than 1 / 20λ@632.8nm; The RMS value of the system aberration is better than 1 / 10λ@632.8nm, the aperture of the light is 30mm, and the focal length of the lens is f=0.154m. The CCD camera adopts the SP620 beam profiler from American Spiricon Company. Its main performance parameters are: the working band is 190nm-1100nm, the pixel size is 4.4um*4.4um, and the number of pixels is 1600*1200.

[0020] 2. Group 2 of the front optical path: off-axis afocal...

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Abstract

The invention discloses a polarization-maintaining large-range directional quantum communication optical device and method based on a U-shaped optical path. Based on polarization-maintaining, large-range tracking, pointing and system quantum transmission functions of the U-shaped optical path, quantum polarization coding transmission is carried out by utilizing the characteristics of large two-dimensional tracking range, high response speed and the like of the U-shaped optical path and utilizing the polarization maintaining characteristic of the quantum communication system, namely, the bit error rate is reduced. According to the system, optical path establishment is mainly carried out through camera tracking, quantum transmission is carried out through system polarization maintaining transmission, and therefore a composition system capable of achieving rapid tracking and precise quantum communication is formed. The device and method are suitable for the field of rapid tracking and isalso suitable for the field of quantum communication. The system is simple in structure and high in engineering practice capability.

Description

technical field [0001] The invention discloses a U-shaped optical path-based polarization-maintaining, large-range pointing quantum communication optical device and method, which are particularly suitable for the field of quantum communication and long-distance tracking and alignment. Background technique [0002] With the deepening of the research on the polarization of light, people gradually realize the wide application prospect of polarization information, and the polarization technology has also begun to enter the practical stage. 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 field of technology and t...

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Application Information

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IPC IPC(8): H04B10/67H04B10/70
CPCH04B10/671H04B10/70
Inventor 吴金才王天洪何志平张亮闫志欣贾建军舒嵘王建宇
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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