Field Test of Classical Symmetric Encryption with Continuous Variable Quantum Key Distribution

TL;DR

This paper presents a six-month field test of a classical symmetric encryption link secured by continuous variable quantum key distribution, demonstrating its reliability and potential for IT security infrastructure.

Contribution

It is the first long-term field demonstration of a CVQKD system integrated with classical encryption, showing practical viability in real-world environments.

Findings

Reliable operation over six months in a server room environment

Successful continuous key renewal for symmetric encryption

Strengthens CVQKD's potential for security infrastructure deployment

Abstract

We report on the design and performance of a point-to-point classical symmetric encryption link with fast key renewal provided by a Continuous Variable Quantum Key Distribution (CVQKD) system. Our system was operational and able to encrypt point-to-point communications during more than six months, from the end of July 2010 until the beginning of February 2011. This field test was the first demonstration of the reliability of a CVQKD system over a long period of time in a server room environment. This strengthens the potential of CVQKD for information technology security infrastructure deployments.