Maintenance-free Operation of WDM Quantum Key Distribution System through a Field Fiber over 30 Days
Ken-ichiro Yoshino, Takao Ochi, Mikio Fujiwara, Masahide Sasaki, and, Akio Tajima
TL;DR
This paper demonstrates a maintenance-free WDM quantum key distribution system operating continuously for 30 days over a field fiber, achieving low error rates and high key rates with stable performance.
Contribution
It introduces a stable, maintenance-free QKD system using polarization-independent interferometers and stabilization over a real-world fiber link for an extended period.
Findings
Quantum bit error rate as low as 1.70%
Key rate as high as 229.8 kbps
Accumulated secure key of 595.6 Gbits over 30 days
Abstract
Maintenance-free wavelength-division-multiplexing quantum key distribution for 30 days was achieved through a 22-km field fiber. Using polarization-independent interferometers and stabilization techniques, we attained a quantum bit error rate as low as 1.70% and a key rate as high as 229.8 kbps, making the record of total secure key of 595.6 Gbits accumulated over an uninterrupted operation period.
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