Satellite-Based Continuous-Variable Quantum Communications: State-of-the-Art and a Predictive Outlook

TL;DR

This paper reviews the current state and future prospects of satellite-based continuous-variable quantum communications, highlighting its potential to enhance global quantum internet infrastructure.

Contribution

It provides a comprehensive survey of the advancements and outlook in space-based continuous-variable quantum communication technologies.

Findings

Satellite quantum communication has transitioned from discrete-variable to continuous-variable regimes.

CV quantum communication offers potential for improved performance over existing methods.

The development of space-based CV quantum links is crucial for global quantum internet expansion.

Abstract

The recent launch of the Micius quantum-enabled satellite heralds a major step forward for long-range quantum communication. Using single-photon discrete-variable quantum states, this exciting new development proves beyond any doubt that all of the quantum protocols previously deployed over limited ranges in terrestrial experiments can, in fact, be translated to global distances via the use of low-orbit satellites. In this work, we survey the imminent extension of space-based quantum communication to the continuous-variable regime - the quantum regime perhaps most closely related to classical wireless communications. The CV regime offers the potential for increased communication performance and represents the next major step forward for quantum communications and the development of the global quantum internet.