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Entangled photon pair transmission rate estimation method for satellite-ground downlink

A downlink and transmission rate technology, applied in the field of entangled photon pair transmission rate estimation, can solve the problems of low transmission rate accuracy, fuzzy estimation process, and no clear description of the type and quantity of measurement bases, so as to improve estimation accuracy and ensure transmission. Fidelity effect

Active Publication Date: 2019-01-25
XIDIAN UNIV +1
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Problems solved by technology

However, the disadvantage of this method is that this method only considers the weather conditions in different climates of the atmosphere, and does not consider the influence of turbulence during the oblique transmission of light quantum and the different characteristics of light quantum transmission in vacuum and atmosphere, resulting in the accuracy of the transmission rate. lower
However, the shortcomings of this method are that the estimation method of the transmission coefficient is not clearly given, and the type and number of measurement bases used by the two ground stations are not clearly stated, and the estimation process is vague

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  • Entangled photon pair transmission rate estimation method for satellite-ground downlink
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  • Entangled photon pair transmission rate estimation method for satellite-ground downlink

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[0046] Refer to attached figure 1 , the specific steps of the present invention are further described in detail.

[0047] Step 1, the atmospheric channel transmits entangled photon pairs.

[0048] The satellite sends two photons in the polarization-entangled photon pair generated by its entangled light quantum source to ground station A and ground station B respectively.

[0049] Step 2, measure the distance between the star and the earth.

[0050] Use the Beidou system clock synchronization method or the master-slave synchronization method to synchronize the clock between the satellite and the ground station.

[0051] The steps of the Beidou system clock synchronization method are as follows:

[0052] In the first step, the Beidou satellite navigation system sends the second synchronization signal and time information to the ground station and the satellite respectively.

[0053] In the second step, the ground station and the satellite use the received second synchronizat...

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Abstract

The invention discloses an entangled photon pair transmission rate estimation method for satellite-ground downlink, which mainly solves the problem that the transmission rate estimation method in theprior art is not clear and comprehensive. The invention realizes the following steps: (1) transmitting entangled photon pairs through an atmospheric channel; (2) measuring the distance between satellite and ground; (3) estimating the photon transmission rate under turbulence; (4) calculating the transmission rate of the single photon satellite-ground downlink; and (5) estimating the transmission rate of entangled photon pairs. The invention comprehensively considers the influence of atmosphere, system and turbulence, estimates the transmission rate of entangled photons by adopting three groupsof measurement bases and two groups of measurement bases receiving and counting methods at two ground stations respectively, and improves the estimation accuracy of the transmission rate. It can be used to measure the Bell state in the process of quantum communication to ensure the fidelity of transmission.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a method for estimating the transmission rate of entangled photon pairs used in the satellite downlink in the technical field of quantum communication. The present invention estimates the downlink transmission rate of entangled photon pairs by comprehensively considering the influence of atmosphere, system and turbulence, and adopting three sets of measurement bases and two sets of measurement bases to receive entangled photon pairs at two ground stations , based on which the Bell state measurement in the quantum communication process is carried out to ensure the fidelity of the state transfer. Background technique [0002] Due to the distance limitation of fiber optic materials, quantum communication is generally transmitted through free space. Compared with optical fiber, there is no birefringence in free space, and the transmission loss of the path is much lower t...

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Application Information

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IPC IPC(8): H04B10/079H04B10/118H04B10/70
CPCH04B10/0795H04B10/07955H04B10/118H04B10/70
Inventor 朱畅华梁亚舒丁世杰刘成基权东晓赵楠何先灯易运晖陈南裴昌幸
Owner XIDIAN UNIV
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