Free-space time-bin encoded quantum key distribution from near- to mid-infrared wavelengths

TL;DR

This paper demonstrates that free-space quantum key distribution using mid-infrared wavelengths outperforms near-infrared systems, especially in adverse weather, by simulating time-bin encoded QKD with weak coherent states.

Contribution

It introduces the use of mid-infrared light sources for free-space QKD and shows their advantages over near-infrared wavelengths in various weather conditions.

Findings

Mid-infrared QKD outperforms near-infrared in adverse weather

Simulation results demonstrate improved link robustness in mid-infrared

Mid-infrared wavelengths enhance quantum communication reliability

Abstract

Quantum technologies play a central role in establishing new ways of quantum-secured communication. We investigate Free-Space Quantum Communication and explore the advantage of implementing Quantum Key Distribution (QKD) with weak coherent states produced by a light source in the Mid-Infrared (>3$\mu$m). We simulate time-bin encoded quantum key distribution and demonstrate that a free-space QKD link operating in the Mid-infrared outperforms configurations based on conventional near-infrared wavelengths under various weather scenarios, with a particular significance in adverse meteorological conditions.