Quantum Communication Device Error Correction Optimization
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Solution Overview
Problem
Conventional quantum communication devices face a challenge in increasing processing time for error correction, which lowers the throughput of quantum key distribution systems, making them less efficient in ensuring data privacy.
Innovation Solution
A quantum communication device is designed with a determination unit that optimizes the order of sift processing data correction and selects the appropriate check matrix based on estimated error rates and correction times, reducing error correcting time and improving throughput by associating sift processing data with estimated error rates and using check matrices with varying error correcting capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error correction processing is performed on all sift processing data, then data privacy safety is improved, but processing time increases and throughput decreases
Solution Approach 1:
The patent applies local quality by differentiating error correction processing based on data characteristics. Instead of uniformly processing all sift processing data, the system identifies and prioritizes correction for data with higher error rates while using simplified or skipped processing for low-error data, thereby optimizing the balance between security and throughput
Solution Approach 2:
The patent changes processing parameters dynamically based on estimated error rates. The determination unit adjusts whether to perform error correction, privacy amplification, or neither, based on the error rate threshold. This parameter-based decision-making allows the system to adapt processing intensity to actual data conditions, improving throughput without compromising security when errors are present
2Productivity
If error correction processing is skipped to increase throughput, then productivity is improved, but data privacy safety deteriorates
Solution Approach 1:
The patent implements feedback through the error rate estimation mechanism. The determination unit receives estimated error rates as feedback and uses this information to decide whether error correction is necessary. This feedback loop ensures that security measures are applied only when actually needed, preventing unnecessary throughput reduction while maintaining data privacy safety
Solution Approach 2:
The patent applies partial action by performing error correction only on a subset of sift processing data - specifically, only on data where the estimated error rate exceeds a predetermined threshold. This partial correction approach avoids the excessive processing of all data while still addressing security concerns for the critical portion of data that actually requires correction
Data Source
AI summary
According to an embodiment, a quantum communication device includes a receiver, a sift processor, an estimator, first and second storages, a determination unit, an error corrector, a measurement unit, and a privacy amplifier. The sift processor acquires sift processing data by referring to a cryptographic key bit string in a predetermined bit string with a reference basis randomly selected from a plurality of bases. The estimator acquires an estimated error rate by estimating an error rate of the sift processing data from an error rate of part of the sift processing data. When a sift processing data volume stored in the first storage is not smaller than a first threshold, the determination unit determines order of the sift processing data to be corrected based on an estimated error rate, an error rate range that a check matrix can correct, and estimated correction time, and the check matrix used for correction.