Quantum Key Distribution Estimator for Real-Time Secure Key Rate Adjustment
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Solution Overview
Problem
In quantum-key distribution systems, adjusting settings to improve the secure key rate is time-consuming and costly due to the lack of real-time feedback on the effects of adjustments during the encryption-key generation process, as the accurate secure key rate is only known after completing all processing phases.
Innovation Solution
A quantum-key distribution apparatus comprising a quantum-key sharer, shifter, corrector, privacy amplifier, and estimator, which performs photon sharing, shifting, error correction, and privacy amplification processing while estimating the secure key rate at each phase, allowing for real-time adjustments based on initial and measured values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adjustment items are set during encryption-key generation operation to improve secure key rate, then the secure key rate increases, but the maintenance time and cost increase due to trial and error adjustments
Solution Approach 1:
The patent implements a feedback mechanism by calculating and displaying the secure key rate during each phase of the encryption-key generation operation (photon sharing, shifting, error correction, privacy amplification). This allows operators to see the effect of adjustment items in real-time rather than waiting for the entire process to complete, enabling informed adjustments without trial and error
Solution Approach 2:
The patent calculates the secure key rate at each intermediate phase before the entire encryption-key generation process completes. This preliminary calculation provides advance information about the final secure key rate, allowing operators to make adjustments based on projected outcomes rather than relying on past experience or trial and error
2Productivity
If adjustment items are set during encryption-key generation operation, then the secure key rate can be improved, but the complexity of determining which adjustment items to change increases
Solution Approach 1:
The feedback mechanism displays the calculated secure key rate at each phase, providing clear quantitative information about the system's performance. This eliminates the need for operators to rely on past experience or guess which adjustment items to modify, as they can directly observe the impact of current settings on the secure key rate
Solution Approach 2:
The patent introduces an intermediary calculation system that processes the outputs from each phase (photon sharing, shifting, error correction, privacy amplification) and computes the secure key rate. This intermediary provides a clear metric that guides adjustment decisions, simplifying the complexity of determining which parameters to modify
Data Source
AI summary
According to an embodiment, a quantum-key distribution apparatus includes a quantum-key sharer, a shifter, a corrector, a privacy amplifier, and an estimator. The quantum-key sharer performs photon sharing processing and acquires a photon bit string. The shifter generates a shared bit string by performing shifting processing. The corrector generates a corrected bit string by correcting errors in the shared bit string by performing error correction processing. The privacy amplifier generates an encryption key by performing privacy amplification processing that compresses the corrected bit string. The estimator estimates an encryption-key generation rate based on an output value and a given value at execution phases of respective pieces of processing of the photon sharing processing, the shifting processing, the error correction processing, and the privacy amplification processing.