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A Calculation Method for Encoding Error Rate of Quantum Key Generation System

A technology for generating system and quantum keys, which is applied in transmission systems, digital transmission systems, and key distribution. It can solve problems such as large phase error rate estimates, difficult to satisfy, and complex calculation formulas, and achieve code rate improvement and estimated values. Tight, easy-to-calculate effects

Active Publication Date: 2022-07-05
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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  • A Calculation Method for Encoding Error Rate of Quantum Key Generation System
  • A Calculation Method for Encoding Error Rate of Quantum Key Generation System
  • A Calculation Method for Encoding 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: The sender and the receiver perform base vector comparison;

[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 The bit error rate measured by the Z basis vector for the receiver 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's Z basis vector

[0042]

[0043] where 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 yield of the quantum state |->, which can be directly measur...

Embodiment 2

[0055] Step 1: The sender and receiver of the quantum key distribution system prepare, transmit and measure quantum states; however, the transmission and preparation of the quantum states are performed 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 states, for the quantum states prepared by the sender in strict accordance with the requirements of the simplified BB84 protocol, strictly follow the simplified BB84 protocol. measurement requirements.

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

[0059] Among t...

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Abstract

This application provides a calculation method for the coding error rate of a quantum key generation system, which can be used for the calculation of the coding error rate of the simplified BB84 protocol, and thus provides the coding error rate of the communication system. It does not need to depend on the basic detection efficiency conditions, and the estimated value of the phase error rate is more compact and the calculation method is simpler. The main steps include: Step 1: The sender and receiver of quantum key distribution perform quantum state preparation, transmission and measurement according to the simplified BB84 protocol; Step 2: The sender and receiver perform basis vector comparison; Step 3: Send The receiver and the receiver perform error correction to obtain the bit error rate measured by the receiver with the Z basis vector; Step 4: Calculate the phase error rate measured by the receiver with the Z basis vector; Amplify privacy and get bit rate.

Description

technical field [0001] A calculation method for the coding error rate of a quantum key generation system is provided to solve the problem of relying on the detection efficiency of the receiver detection unit in the prior art, improve the estimation of the relevant 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 consists of 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, the receiver receives and detects the quantum state from the quantum channel (or shared channel), and the two parties exchange necessary information through the public channel, through data post-processing, including error correction, privacy amplification, etc. , an...

Claims

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Application Information

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Patent Type & Authority Patents(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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