Continuous-Variable Quantum Key Distribution Over 60 km Optical Fiber With Real Local Oscillator

TL;DR

This paper demonstrates a pioneering continuous-variable quantum key distribution over 60 km fiber using a local oscillator, employing machine learning for phase noise control to ensure secure key generation.

Contribution

It introduces a novel experimental setup that combines local oscillator generation with machine learning-based noise management for long-distance quantum communication.

Findings

Secure key generation over 60 km fiber achieved

Machine learning effectively controls phase noise

Low modulation variance maintains system security

Abstract

We report the first continuous-variable quantum key distribution experiment that enables the generation of secure key over a 60 km fiber channel with locally generated local oscillator. This is achieved by controlling the excess noise using machine learning for phase noise compensation while operating the system at a low modulation variance