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Single photon level detection system, single photon level detection method and single photon level detection device of transmitting end of quantum communication system

A technology of quantum communication and level detection, applied in the field of quantum communication, can solve problems such as difficulty in preparing single-photon pulses

Active Publication Date: 2018-11-02
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation of single-photon pulses is relatively difficult at this stage, and its preparation cost far exceeds the preparation cost of classical signals

Method used

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  • Single photon level detection system, single photon level detection method and single photon level detection device of transmitting end of quantum communication system
  • Single photon level detection system, single photon level detection method and single photon level detection device of transmitting end of quantum communication system
  • Single photon level detection system, single photon level detection method and single photon level detection device of transmitting end of quantum communication system

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Experimental program
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Embodiment 1

[0034] figure 2 A schematic structural diagram of a single-photon level detection system at the sending end of a quantum communication system according to an embodiment of the present invention is shown, and the system is set at the receiving end of the quantum communication system. Such as figure 2 As shown, it includes a photon counting device A, a light pulse number acquisition device B and a computing device C.

[0035] The single photon detection device A is used to obtain the number of single photons in the signal state optical pulses received by the receiving end during the key transmission phase. The optical pulse number acquisition device B is used to acquire the number of signal state optical pulses emitted by the sending end during the key transmission phase. The calculation device C is used to calculate the single photon level of the light pulse emitted by the sending end according to the number of single photons in the signal state light pulse and the number o...

Embodiment 2

[0038] image 3 A schematic structural diagram of a single-photon level detection system at the sending end of another quantum communication system according to an embodiment of the present invention is shown, and the system is set at the receiving end of the quantum communication system. The difference from Embodiment 1 is that the single-photon detection device A includes a single-photon detector A1 and a screening device A2.

[0039] The single photon detector A1 is used to obtain the number of single photons in the light pulse received by the receiving end, and output a single photon detection counting sequence. The detection sequence consists of a series of counts, each count corresponding to the number of single photons in a light pulse. The screening device A2 is used to screen out the number of single photons in the signal state light pulse from the detection and counting sequence.

[0040] When the sending end emits a quantum signal optical pulse, it will send a typ...

Embodiment 3

[0046] Figure 6 It shows a flow chart of a single-photon level detection method at the sending end of a quantum communication system according to an embodiment of the present invention. The method detects the single-photon level at the sending end at the receiving end of the quantum communication system, which can be achieved by implementing the first or second embodiment The system described above is implemented. Such as Figure 6 As shown, the method includes the following steps:

[0047] S10: In the key transmission stage, acquiring the number of single photons in the signal state light pulse received at the receiving end of the quantum communication system.

[0048] When the sending end emits a quantum signal optical pulse, it will send a type identification signal (such as a type identification optical pulse). Step S10 can immediately search for the corresponding time t according to the time t corresponding to the type identification signal after receiving the quantum ...

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Abstract

The invention discloses a single photon level detection system, a single photon level detection method and a single photon level detection device of a transmitting end of a quantum communication system, wherein the single photon level detection system comprises a single photon probing device, an optical pulse number acquisition device and a calculation device, wherein the single photon probing device is used for acquiring the number of single photons in signal status optical pulses received by the receiving end at a key transmission stage; the optical pulse number acquisition device is used for acquiring the number of the signal status optical pulses transmitted by the transmitting end at the key transmission stage; and the calculation device is used for calculating the single photon levelof the optical pulses transmitted by the transmitted end according to the number of the single photons in the signal status optical pulses and the number of the signal status pulses. With the singlephoton level detection system, the single photon level detection method and the single photon level detection device provided by the invention, the transmitting end of the quantum communication systemcannot make a final detection result be an expected value thereof through modifying a value of the number of the signal status optical pulses, and thus, security of the quantum communication system is improved.

Description

technical field [0001] The invention relates to the technical field of quantum communication, in particular to a single photon level detection system, method and device at the sending end of a quantum communication system. Background technique [0002] There are three core technologies in quantum communication, namely single photon source technology, quantum encoding and transmission technology, and single photon detection technology. Numerous studies have demonstrated that quantum communication using single-photon sources is absolutely safe and highly efficient. Based on security considerations, in order to ensure that the communication process will not be attacked by photon splitting, the ideal single-photon source should strictly meet the requirement that each pulse contains only one photon. At present, most experiments can only obtain single-photon sources by using strongly attenuated coherent light sources. In weakly coherent light, the probabilities of null pulses, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04B10/70
CPCH04B10/70H04L9/0852
Inventor 张小建吴鹏刘国军李建岐张梓平孟凡博葛维春申扬周旭
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD