Calculation method for coding error rate of quantum key generation system

A technology for generating systems and calculation methods, applied in transmission systems, digital transmission systems, and key distribution, can solve the problems of large phase error rate estimates, difficult to satisfy, and complex calculation formulas, so as to achieve improved code rate and tighter estimates. The effect of simple calculation method

Active Publication Date: 2021-06-08
BEIJING ZHONGCHUANGWEI NANJING QUANTUM COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the simplified BB84 protocol needs to meet the detection efficiency condition that the measurement basis is independent, which is difficult to satisfy in some quantum key distribution systems
For example, for a time-phase-encoded quantum key distribution system based on passive basis selection, the detection efficiency of the phase basis is usually 3dB smaller than that of the time basis
[0006] At the same time, when the phase error rate estimation of the above scheme is performed, the existing calculation formula is relatively complicated. Under the condition of long-distance quantum key distribution, the estimated value of the phase error rate is relatively large, which will seriously reduce the security code rate.

Method used

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  • Calculation method for coding error rate of quantum key generation system
  • Calculation method for coding error rate of quantum key generation system
  • Calculation method for coding error rate of quantum key generation system

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Effect test

Embodiment 1

[0036] Step 1: The sender and receiver of the quantum key distribution system prepare, transmit and measure the quantum state according to the simplified BB84 protocol;

[0037] Step 2: base vector comparison between the sender and the receiver;

[0038] Step 3: The sender and receiver of the data processing module of the quantum key distribution system perform error correction to obtain the bit error rate measured by the receiver using the Z basis vector

[0039]

[0040] Among them, E z is the bit error rate measured by the receiver using the Z base vector, which can be directly measured.

[0041] Step 4: The data processing module of the quantum key distribution system calculates the phase error rate measured by the receiver using the Z basis vector

[0042]

[0043] Among them, Y a,- (a=0,1) means that the sender uses the Z basis vector to send out the quantum state |a>, and the receiver uses the X basis vector to detect the quantum state |->, which can be dir...

Embodiment 2

[0055] Step 1: The sender and receiver of the quantum key distribution system prepare, transmit and measure the quantum state; however, the sending and preparation of the quantum state are carried out as follows: the sender prepares no less than three quantum states, However, three of the quantum states are prepared in strict accordance with the requirements of the simplified BB84 protocol; when the receiver measures the received quantum state, the quantum state prepared by the sender in strict accordance with the requirements of the simplified BB84 protocol is strictly in accordance with the simplified BB84 protocol. requirements for measurement.

[0056] Step 2: The sender and the receiver perform base vector comparison through the open channel;

[0057] Step 3: The sender and receiver of the data processing module of the quantum key distribution system perform error correction to obtain the bit error rate measured by the receiver using the Z basis vector

[0058]

[0...

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Abstract

The invention provides a calculation method for the coding error rate of a quantum key generation system, the calculation method can be used for calculation of the coding error rate of a simplified BB84 protocol, the coding rate of a communication system is given, the calculation method does not need to depend on a basic detection efficiency condition, the estimated value of the phase error rate is more compact, and the detection efficiency is improved. And the calculation mode is relatively simple. The method mainly comprises the following steps: step 1, a sender and a receiver of quantum key distribution perform preparation, transmission and measurement of a quantum state according to a simplified BB84 protocol; step 2, the sender and the receiver carry out basis vector comparison; step 3, the sender and the receiver carry out error correction to obtain a bit error rate measured by the receiver by using the Z basis vector; step 4, calculating a phase error rate measured by the receiver by using the Z basis vector; and 5, carrying out privacy amplification on the secret key after the basis vector information is discarded to obtain a code rate.

Description

technical field [0001] A calculation method for the coding error rate of a quantum key generation system is used to solve the problem in the prior art that depends on the detection efficiency of the receiver's detection unit, improve the estimation of the related error rate, and simplify the calculation method. Background technique [0002] Quantum key distribution is one of the most promising technologies in quantum information technology. The quantum key distribution system mainly includes two parts: one is the hardware part, including sending, receiving and measuring devices; the other is software and post-processing of data. In the quantum key distribution protocol, the sender prepares the quantum state, and the receiver receives and detects the quantum state from the quantum channel (or shared channel). , and finally both parties get the key. [0003] Recently, a simplified BB84 protocol (simplified BB84 protocol, D. Rusca, A. Boaron, M. Curty, A. Martin, and H. Zbinde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
CPCH04L9/0858
Inventor 不公告发明人
Owner BEIJING ZHONGCHUANGWEI NANJING QUANTUM COMM TECH CO LTD
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