Free-Space Time-Bin Encoded Quantum Key Distribution from Near- to Mid-Infrared Wavelengths

Quantum technologies play a central role in establishing new ways of quantum-secured communication. This work investigates free-space quantum communication and explores the advantage of implementing quantum key distribution (QKD) with weak coherent states produced by a light source in the mid-infrared ((Formula presented.)). Time-bin encoded quantum key distribution is simulated, and it is demonstrated 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.