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

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...

AI Technical Summary

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.

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