Continuous operation of high bit rate quantum key distribution

摘要

We demonstrate a quantum key distribution with a secure bit rate exceeding 1Mbit/s over 50 km fiber averaged over a continuous 36-hours period. Continuousoperation of high bit rates is achieved using feedback systems to control pathlength difference and polarization in the interferometer and the timing of thedetection windows. High bit rates and continuous operation allows finite keysize effects to be strongly reduced, achieving a key extraction efficiency of96% compared to keys of infinite lengths.