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, electromagnetic wave transmission systems, etc., can solve problems such as large estimated phase error rate, complex calculation formula, and lower security code rate, and improve the code rate. , the calculation method is simple, and the estimated value is compact

Active Publication Date: 2021-06-08
BEIJING ZHONGCHUANGWEI NANJING QUANTUM COMM TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0006] However, the three-state protocol of four transmissions and three 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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  • 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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Experimental program
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Effect test

Embodiment 1

[0037] Step 1: The sender and receiver of quantum key distribution prepare and measure the quantum state respectively according to the three-state protocol of four transmissions and three receptions;

[0038] Step 2: The sender and the receiver perform base vector comparison through the open channel;

[0039] Step 3: The sender and the receiver perform error correction to obtain the bit error rate measured by the receiver using the Z base vector

[0040]

[0041] Among them, E z It is the bit error rate measured by the Z base vector at the receiving side, which can be directly obtained by actual measurement.

[0042] Step 4: Calculate the phase error rate measured by the receiver using the Z-basis vector

[0043]

[0044] Among them, Y -,+ The quantum state |-> is prepared for the sender using the X basis vector, and the yield obtained by the receiver using the X basis vector to measure the quantum state |+> can be measured in real time during communication. Y +...

Embodiment 2

[0055] Step 1: The sender of the quantum key distribution prepares the quantum states according to the communication protocol of no less than four quantum states, and the four quantum states are prepared strictly according to the three-state protocol of four transmissions and three receptions. The receiver measures each quantum state sent by the sender according to the three-state protocol of four transmissions and three receptions. The four quantum states prepared by the sender according to the three-state protocol of four transmissions and three receptions are strictly in accordance with the three state protocol to measure it;

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

[0057] Step 3: The sender and the receiver perform error correction to obtain the bit error rate measured by the receiver using the Z base vector

[0058]

[0059] Among them, E z It is the bit error rate measured by the Z base vector at the r...

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Abstract

The invention provides a calculation method for the coding error rate of a quantum key generation system, and the calculation method is used for calculating the coding error rate of a four-transmitting three-receiving three-state protocol, so that better coding rate estimation is obtained, 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 calculation result is more accurate. 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 quantum state preparation and measurement according to a four-sending three-receiving three-state 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] In order to simplify the complexity of the experimental setup of the quantum key distribution system, the researchers p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/079H04L9/08
CPCH04B10/07953H04L9/0858H04L9/0852
Inventor 不公告发明人
Owner BEIJING ZHONGCHUANGWEI NANJING QUANTUM COMM TECH CO LTD
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