A field trial of twin-field QKD with independent optical frequency combs produced a finite-size secure key rate of 0.53 bit/s at 546 km and an asymptotic rate of 0.12 bit/s at 603 km over deployed fiber.
For each OFC, its 25 GHz driver is referenced to a local Rubidium frequency standard of with a short-term (1 s) stability of 2 × 10−11 and an accuracy of 5 × 10−11
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Independent Optical Frequency Combs Powered 546 km Field Test of Twin-Field Quantum Key Distribution
A field trial of twin-field QKD with independent optical frequency combs produced a finite-size secure key rate of 0.53 bit/s at 546 km and an asymptotic rate of 0.12 bit/s at 603 km over deployed fiber.