Quantum Key Distribution Error Rate Stabilization
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Solution Overview
Problem
In quantum key distribution systems integrated with optical data communication networks, the strong optical intensity of data communication channels causes noise in photon communication channels, leading to increased error rates and instability in quantum key distribution operations.
Innovation Solution
A communication device with a quantum key sharing unit, a key distilling unit, and a communication function varying unit is used, which generates shared cryptographic keys through quantum key distribution and measures error rates in the photon communication channel, adjusting the communication function by limiting or releasing optical data communication to maintain low error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If optical data communication is performed using the same optical fiber link for quantum key distribution, then the cost of laying new optical fiber is reduced, but the strong optical intensity of data communication causes noise in the photon communication channel, leading to increased error rates
Solution Approach 1:
The optical communication path is segmented into two separate communication channels: a photon communication channel for quantum key distribution and an optical data communication channel for data transmission. This segmentation allows both functions to coexist while minimizing interference, as each channel can be optimized for its specific purpose with appropriate wavelength allocation and transmission parameters.
Solution Approach 2:
Different quality characteristics are applied to different parts of the optical communication system. The photon communication channel uses weak optical intensity suitable for quantum key distribution, while the optical data communication channel uses strong optical intensity for efficient data transmission. This local quality differentiation resolves the contradiction by allowing each channel to operate with optimal parameters without compromising the other.
2Productivity
If the optical data communication channel operates continuously, then data communication efficiency is maintained, but the error rate in the photon communication channel increases due to optical noise
Solution Approach 1:
The optical data communication is performed in periodic intervals rather than continuously. During designated time slots, data communication is activated while quantum key distribution is suspended, and vice versa. This periodic action allows both communication functions to share the optical fiber resource while preventing simultaneous interference, thereby maintaining data communication efficiency while ensuring reliable quantum key distribution when it occurs.
Solution Approach 2:
The communication function of the optical data communication channel is made dynamic and adjustable based on the operational state of the quantum key distribution system. When quantum key distribution is being performed, the data communication channel is limited or shut down; when quantum key distribution is not active, data communication can proceed normally. This dynamic control resolves the contradiction by adapting the system behavior to current operational requirements.
Data Source
AI summary
According to an embodiment, a communication device is connected to another communication device through an optical communication path to generate an identical cryptographic key shared among the communication devices. The communication device includes a key sharing unit, a key distilling unit, a measuring unit, and a varying unit. The key sharing unit is configured to generate a shared bit string through quantum key distribution with the another communication device. The key distilling unit is configured to generate the cryptographic key from the shared bit string by a key distillation process. The measuring unit is configured to measure an error rate occurring in a photon string transmitted and received via a photon communication channel. The varying unit is configured to vary, based on the error rate, a communication function by applying a limitation on the optical data communication of an optical data communication channel or by releasing the limitation.