Improved method for free-space quantum channel performance
A quantum channel and free space technology, applied in the field of communication, can solve the problem of the limitation of the longest transmission distance of optical fiber communication, and achieve the effect of high single photon reception rate
Active Publication Date: 2021-06-29
SHAANXI AEROSPACE LANXI TECH DEV CO LTD
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Problems solved by technology
Due to the noise interference at the single photon detector end and the link loss of the single photon in the quantum channel transmission process, the furthest transmission distance of optical fiber communication is greatly limited
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[0035] In order to further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific implementation, structural features and effects of the present invention will be described in detail below in conjunction with the accompanying drawings and examples.
[0036] In describing the present invention, it should be understood that the terms "inner", "outer", "vertical", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention.
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The invention relates to a method for improving the performance of a free-space quantum channel, comprising the following steps: a transmitting terminal of a ground station transmits a single photon pulse, and the single photon pulse first passes through the atmosphere and then is transmitted to a satellite receiving terminal; the single photon pulse obtained by the satellite receiving terminal The photon pulse is reflected to the receiving terminal of the ground station, and the receiving terminal uses a single photon detector to receive the signal and obtain energy hv, which triggers the counter to work and simultaneously counts single photons. The invention provides a single-photon receiving efficiency model under the condition of different intensity atmospheric turbulence interference, and in addition, the receiving terminal can ensure a higher single-photon receiving rate by selecting a suitable antenna aperture.
Description
technical field [0001] The invention belongs to the field of communication, and in particular relates to a method for improving the performance of a free-space quantum channel. Background technique [0002] During the transmission of a single photon in a free-space quantum communication channel, its transmission distance is limited by obstacles such as the atmospheric environment and experimental equipment. The most critical issues are beam drift, broadening and deformation caused by atmospheric turbulence, and the stability of the optical system for the transmission of single photon beams in the external environment. At the same time, the single-photon beam will be constrained by the geographical aspects of the earth (curvature, topography, obstacles, etc.) during transmission, as well as the absorption of radiation from the lower atmosphere. Atmospheric turbulence, a dominant form of atmospheric motion, is a major obstacle to single photon transport in free space. [000...
Claims
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IPC IPC(8): H04L9/08H04B10/11H04B10/70H04B17/382H04B17/391
CPCH04B10/11H04B10/70H04L9/0852H04B17/382H04B17/3912
Inventor 车志刚
Owner SHAANXI AEROSPACE LANXI TECH DEV CO LTD