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Digital Quantum Key Distribution is an emerging approach that digitizes quantum signals for transmission over existing telecom infrastructure with greater flexibility. Traditional QKD uses analog photonic signals that degrade with distance and require careful analog processing. DQKD converts quantum measurements to digital form immediately at the detector, then processes digitally. This enables: software-defined quantum networking where quantum protocols are implemented in programmable hardware, easier integration with classical digital communication systems, more flexible error correction and privacy amplification algorithms, and potential for quantum network virtualization. The approach also simplifies hardware by moving complexity from analog optics to digital signal processing. Research implementations show DQKD can achieve comparable security to analog QKD while offering better scalability and maintainability. QNu Labs explores DQKD capabilities for next-generation quantum network platforms.
Analog quantum systems are complex and difficult to maintain - they require specialized optical expertise and constant calibration. Digital processing is well-understood by telecom engineers and benefits from decades of digital communication advances. DQKD brings quantum security into the familiar digital domain, potentially accelerating commercial adoption.
DQKD could reduce QKD deployment complexity and cost by leveraging standard digital telecom equipment and expertise. It enables software-defined quantum networks where protocols can be updated remotely without hardware changes. For telecom operators, DQKD fits naturally into existing network operations and management systems.
Next-generation telecom quantum networks, software-defined quantum key distribution, hybrid quantum-classical network infrastructure, quantum network function virtualization, simplified QKD for enterprise deployments, quantum network automation and orchestration, research into quantum network protocols
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