Satellite Quantum Communication via the Alphasat Laser Communication Terminal

TL;DR

This paper explores the adaptation of laser communication terminals for quantum key distribution via satellite, leveraging quantum effects and continuous-variable techniques to enable secure long-distance quantum communication.

Contribution

It introduces a novel approach to modify existing laser communication terminals for quantum communication, validated through initial satellite measurement campaigns.

Findings

Successful adaptation of LCTs for quantum key distribution

Validation of quantum communication over satellite links

Potential for scalable global quantum networks

Abstract

By harnessing quantum effects, we nowadays can use encryption that is in principle proven to withstand any conceivable attack. These fascinating quantum features have been implemented in metropolitan quantum networks around the world. In order to interconnect such networks over long distances, optical satellite communication is the method of choice. Standard telecommunication components allow one to efficiently implement quantum communication by measuring field quadratures (continuous variables). This opens the possibility to adapt our Laser Communication Terminals (LCTs) to quantum key distribution (QKD). First satellite measurement campaigns are currently validating our approach.