Long-distance continuous-variable quantum key distribution over 100-km fiber with local local oscillator.

ABSTRACT: Quantum key distribution (QKD) enables two remote parties to share encryption keys with security based on the laws of physics. Continuous-variable (CV) QKD with coherent states and coherent detection integrates well with existing telecommunication networks. Thus far, long-distance CV-QKD has only been demonstrated using a highly complex scheme where the local oscillator is transmitted, opening security loopholes for eavesdroppers and limiting potential applications. Here, we report a long-distance CV-QKD experiment with a locally generated local oscillator over a 100-kilometer fiber channel with a total loss of 15.4 decibels. This record-breaking distance is achieved by controlling the phase noise-induced excess noise through a machine learning framework for carrier recovery and optimizing

SUBMITTER: Hajomer AAE 

PROVIDER: S-EPMC10776027 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature