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A long-distance high-efficiency optical quantum key transmission method and system

A transmission method and photon technology, applied in the field of photon quantum communication, can solve the problems of unable to achieve normal communication, unstable transmission effect, inability to distinguish whether there is an eavesdropper, etc., and achieve the effects of convenient operation, simple implementation method and high efficiency

Active Publication Date: 2022-06-10
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the transmission effect is unstable, and it may not be possible to distinguish whether there is an eavesdropper, or even to achieve normal communication

Method used

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  • A long-distance high-efficiency optical quantum key transmission method and system
  • A long-distance high-efficiency optical quantum key transmission method and system
  • A long-distance high-efficiency optical quantum key transmission method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: After selecting the line that needs to transmit the key, monitor the entire optical path to ensure that there is no eavesdropper interfering with the measurement; the sender sends 20 photons and photons whose polarization direction is horizontal, and informs them through the public channel The receiving end measures the number of horizontally polarized photons. Assuming that the attenuation rate of the entire line is calculated to be 30% (attenuation rate = [number of transmitted photons - number of received photons] / number of transmitted photons × 100%), the error of the calculated attenuation rate after repeated operations is ±5 within %;

[0030] Step 2: Prepare a random mixed state polarized photon pulse signal. The sender prepares multiple laser generators, so that each laser passes through a controllable switch to produce pulses with different numbers of photons. In communication fibers, random mixed-state polarized photon pulses are prepared. The first...

Embodiment 2

[0050] Step 1: After selecting the line that needs to transmit the key, monitor the entire optical path to ensure that no eavesdroppers interfere with the measurement along the way; the sender sends 30 photons and photons with a horizontal polarization direction, and informs them through the public channel The receiving end measures the number of horizontally polarized photons. Assuming that the attenuation rate of the entire line is calculated to be 50% (attenuation rate = [number of transmitted photons - number of received photons] / number of transmitted photons × 100%), the error of the calculated attenuation rate after repeated operations is ±5 within %;

[0051] Step 2: Prepare a random mixed state polarized photon pulse signal. The sender prepares multiple laser generators, so that each laser passes through a controllable switch to prepare pulses with different numbers of photons (the pulse interval is consistent), and then passes through polarizers with different angles...

Embodiment 3

[0071] Step 1: After selecting the line that needs to transmit the key, monitor the entire optical path to ensure that no eavesdroppers interfere with the measurement along the way; the sender sends photons containing 50 photons and the polarization direction is horizontal, and informs them through the public channel The receiving end measures the number of horizontally polarized photons. Assuming that the attenuation rate of the entire line is calculated to be 80% (attenuation rate = [number of transmitted photons - number of received photons] / number of transmitted photons × 100%), the error of the calculated attenuation rate after repeated operations is ±5 within %;

[0072]Step 2: Prepare a random mixed state polarized photon pulse signal. The sender prepares multiple laser generators, so that each laser passes through a controllable switch to prepare pulses with different numbers of photons (the pulse interval is consistent), and then passes through polarizers with differ...

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Abstract

The invention discloses a long-distance and high-efficiency optical quantum key transmission method, which includes selecting a line that needs to transmit the key, preparing a random mixed state polarized photon pulse signal, controlling the total number of sent pulse photons to be less than or equal to twice the number of optical pulse mixed states, and sending The party compares the calculated value with the actual measured value of the receiving end and compares it with the standard attenuation rate. According to the error of the attenuation rate, the sender adopts the rounding scheme and informs the receiving end of the rounding scheme through the public channel. The two parties compare the remaining sequence results Carry out rounding to obtain the shared key of both parties. Therefore, the present invention can ensure that eavesdroppers cannot decipher, and can realize long-distance efficient transmission. The operation is convenient, the realization method is relatively simple, the efficiency is high, and the long-distance transmission of light quantum information can be guaranteed to be absolutely safe. The safe and reliable quantum communication method has use value.

Description

technical field [0001] The invention relates to the technical field of optical quantum communication, in particular to a long-distance high-efficiency optical quantum key transmission method and a system thereof. Background technique [0002] In optical quantum communication, only the use of single photons as an independent information carrier can satisfy the principle of quantum non-cloning, which is absolutely safe and can prevent eavesdroppers from eavesdropping. However, due to a series of problems such as poor anti-interference ability, high difficulty of operation and implementation and low efficiency of single-photon coding communication. For example, using optical fiber transmission, the signal attenuation is large, and only successful in short-distance experiments; and the direct transmission of signals through the atmosphere is susceptible to climate influence, and even causes communication interruptions in harsh weather conditions. Atmospheric molecules such as o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08H04B10/70H04B10/85H04B10/50H04B10/532
CPCH04L9/0858H04B10/70H04B10/85H04B10/503H04B10/532
Inventor 毛逢银毛源
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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