Continuous operation of high bit rate quantum key distribution
A R Dixon, Z L Yuan, J F Dynes, A W Sharpe, and A J Shields
TL;DR
This paper demonstrates continuous high bit rate quantum key distribution over 50 km fiber, achieving over 1 Mbit/s securely for 36 hours, with feedback systems ensuring stable operation and high efficiency.
Contribution
It introduces a method for continuous high-rate QKD using feedback control, significantly reducing finite key effects and improving key extraction efficiency.
Findings
Secure bit rate exceeds 1 Mbit/s over 50 km fiber
Continuous operation maintained for 36 hours
Achieves 96% key extraction efficiency
Abstract
We demonstrate a quantum key distribution with a secure bit rate exceeding 1 Mbit/s over 50 km fiber averaged over a continuous 36-hours period. Continuous operation of high bit rates is achieved using feedback systems to control path length difference and polarization in the interferometer and the timing of the detection windows. High bit rates and continuous operation allows finite key size effects to be strongly reduced, achieving a key extraction efficiency of 96% compared to keys of infinite lengths.
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