Quantum Key Distribution Controller for Adaptive Key Rate Management
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Solution Overview
Problem
In quantum key distribution systems, generating large numbers of encryption keys with high frequency leads to increased processing load and storage burden, while maintaining continuous photon transmission is essential to avoid high temporal costs of restarting operations.
Innovation Solution
Implementing a quantum key distribution device with a controller that performs restraining operations, such as deleting or reducing encryption keys, corrected bit strings, or shared bit strings, to manage the generation and storage of encryption keys, ensuring synchronization and reducing processing load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption keys are generated in large numbers with high frequency, then encryption strength and communicable time are improved, but processing load and storage burden increase
Solution Approach 1:
The patent dynamically adjusts the number of encryption keys generated per unit time based on actual communication needs. The controller monitors communication status and modifies key generation parameters (quantity, frequency) to match demand, preventing excessive key generation that would burden processing and storage while maintaining sufficient encryption strength.
2Productivity
If encryption keys are generated continuously during photon transmission, then key availability is improved, but storage burden and processing load increase
Solution Approach 1:
The controller implements feedback control by monitoring communication status and adjusting key generation accordingly. When communication is active, keys are generated to meet demand; when communication pauses or storage approaches capacity, key generation is reduced or suspended. This feedback mechanism balances key availability with storage constraints.
Solution Approach 2:
The system transitions from static continuous key generation to dynamic adaptive key generation. The controller continuously adjusts the key generation rate based on real-time conditions including communication status, storage availability, and processing capacity, optimizing the balance between key availability and resource consumption.
3Device complexity
If photon transmission is stopped to reduce processing load, then processing burden is reduced, but temporal cost of restarting increases
Solution Approach 1:
Instead of completely stopping photon transmission when processing load increases, the system applies partial action by selectively controlling key generation during transmission. The controller can reduce key generation frequency or pause key generation temporarily while maintaining photon transmission, avoiding the high temporal cost of stopping and restarting transmission while still managing processing load.
Data Source
AI summary
According to an embodiment, a quantum key distribution device includes a key sharing unit, a correcting unit, a compressor, and a controller. The key sharing unit is configured to generate a shared bit string by using quantum key distribution performed with another quantum key distribution device via a quantum communication channel. The correcting unit is configured to generate a corrected bit string through an error correction process with respect to the shared bit string. The compressor is configured to generate an encryption key through a key compression process with respect to the corrected bit string. The controller is configured to perform a restraining operation in which the total number of bits of encryption keys generated per unit time by the compressor is smaller than the total number of bits of the encryption keys generated per unit time by the compressor in the case of not performing the restraining operation.