Abstract
Phase drifting is an intrinsic problem in the various phase-encoding quantum key distribution (QKD) system. This letter presents a novel local active phase compensation (LAPC) method, in which the phase drift of the interferometer for each node is tracked and compensated separately. The proof-of-principle demonstration is implemented based on the two common BB84 prepare-and-measure QKD systems, and the experiment result shows that our LAPC setup can run steadily for above 10 hours. A test quantum key distribution based on the Mach–Zehnder interferometer QKD system and the Faraday–Michelson interferometer QKD system with an average quantum bit error rate of 3.8% and 1.9% was achieved, respectively. This study demonstrates the validity of the LAPC method for the BB84 phase-encoding prepare-and-measure QKD system, and then the potential for its use in large-scale QKD networks, while offering a simpler scheme for the practical operation of the MDI-QKD system and the star-type MDI QKD network.
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