A Differential Phase Shift Scheme for Quantum Key Distribution in Passive Optical Networks

TL;DR

This paper introduces a differential phase shift scheme for quantum key distribution in passive optical networks, enabling multi-user secure communication with cost-effective, centralized infrastructure over moderate distances.

Contribution

It presents a novel DPS-based QKD scheme tailored for passive optical networks with a centralized station, optimizing for multi-user deployment and cost efficiency.

Findings

Suitable for multi-user local networks

Cost-effective implementation for network endpoints

Supports moderate-distance quantum communication

Abstract

We propose a scheme for quantum key distribution (QKD) in a passive optical network (PON) based on differential phase shift (DPS) coding. A centralized station including all expensive components serves many users, making it suitable for a true multi-user network in a local environment with moderate distances on the order of a few kilometers. The emphasis lies on an asymmetric design for cost effective implementation of network end points.