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

A technology for generating systems and calculation methods, which is applied to transmission systems, digital transmission systems, and key distribution, can solve problems such as large phase error rate estimates, reduced security code rates, and complex calculation formulas, so as to improve the code rate and estimate The effect of compact value and simple calculation method

Active Publication Date: 2022-07-05
BEIJING ZHONGCHUANGWEI NANJING QUANTUM COMM TECH CO LTD
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Problems solved by technology

[0006] However, the three-state protocol of three transmissions and four receptions needs to meet the detection efficiency condition that the measurement base vector 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
[0007] 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

Examples

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Effect test

Embodiment 1

[0038] Step 1: The sender and receiver of quantum key distribution respectively prepare and measure quantum states according to the three-state protocol of three sending and four receiving;

[0039] Step 2: The sender and the receiver perform base vector comparison through an open channel;

[0040] Step 3: The sender and receiver perform error correction to obtain the bit error rate measured by the receiver using the Z base vector

[0041]

[0042] Among them, E z The bit error rate measured by the Z base vector for the receiver can be obtained directly from the actual measurement.

[0043] Step 4: Calculate the phase error rate measured by the receiver with the Z basis vector

[0044]

[0045] Y +,- The output obtained by preparing the quantum state |+> with the X basis vector for the sender, and measuring the quantum state |-> with the X basis vector at the receiver can be measured in real time during communication. Y +,+ The yield obtained by preparing the qu...

Embodiment 2

[0056] Step 1: The sender of quantum key distribution prepares and transmits quantum signals with no less than three quantum states, and prepares three quantum states in strict accordance with the three-state protocol of three sending and four receiving, and the receiver according to the three sending and four receiving The three-state protocol is used to measure, and the measurement objects are three quantum states prepared by the sender in strict accordance with the three-state protocol of three sending and four receiving;

[0057] Step 2: The sender and the receiver perform base vector comparison through an open channel;

[0058] Step 3: The sender and receiver perform error correction to obtain the bit error rate measured by the receiver using the Z base vector

[0059]

[0060] Among them, E z The bit error rate measured by the Z base vector for the receiver can be directly obtained from the actual measurement.

[0061] Step 4: Calculate the phase error rate measur...

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Abstract

This application provides a calculation method for the coding error rate of a quantum key generation system, the calculation method is used for the calculation of the coding error rate of the three-state protocol of three transmissions and four receptions, and thereby obtains a better coding error rate. The code rate estimation 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 prepare, transmit and measure quantum states according to the three-state protocol of three sending and four receiving; Step 2: The sender and the receiver perform basis vector comparison; Step 3: The sender and receiver perform error correction to obtain the bit error rate measured by the receiver using the Z basis vector; Step 4: Calculate the phase error rate measured by the receiver using the Z basis vector; Step 5: After discarding the basis vector information The secret key is used for privacy amplification to obtain the code 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
CPCH04L9/0852H04L9/0858H04L9/0819
Inventor 不公告发明人
Owner BEIJING ZHONGCHUANGWEI NANJING QUANTUM COMM TECH CO LTD
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