Multichannel Hybrid Quantum Cryptography for Submarine Optical Communications

TL;DR

This paper proposes a multichannel hybrid quantum cryptography method designed for secure submarine optical communications, leveraging high-dimensional discrete-variable QKD and additional security layers to enable long-distance quantum key distribution.

Contribution

It introduces a novel hybrid approach combining multiple channels and security layers for submarine quantum communication beyond current QKD limits.

Findings

Enables secure quantum communication over long submarine distances.

Combines high-dimensional QKD with additional security layers.

Supports multiple channels for enhanced security.

Abstract

We present a multichannel hybrid quantum cryptography approach intended for submarine quantum optical communications between Alice and Bob separated a distance beyond the current QKD possibilities, each located on a coastline. It is based on the difficult of a simultaneous access to $M$ optical submarine channels. The optical lines from the coastline and ideally to the end of the continental platform are governed by the quantum properties of the light under an autocompensating high-dimensional discrete-modulation continuous variable QKD protocol. The hybrid approach consists of combining several secret keys of the $M$ channels and introducing extra layers of security, passive and/or active, on the non quantum optical lines located beyond the continental platform.