Efficient room-temperature molecular single-photon sources for quantum key distribution

TL;DR

This paper demonstrates a room-temperature molecular single-photon source at 785nm for quantum key distribution, achieving a secret key rate of 0.5 Mbps, advancing practical quantum communication technologies.

Contribution

Introduces and experimentally demonstrates a room-temperature, molecule-based single-photon source for QKD with a high secret key rate, enabling practical quantum communication.

Findings

Achieved a secret key rate of 0.5 Mbps.

Operated at room temperature with a molecular source.

Demonstrated feasibility of practical QKD systems.

Abstract

Quantum Key Distribution (QKD) allows the distribution of cryptographic keys between multiple users in an information-theoretic secure way, exploiting quantum physics. While current QKD systems are mainly based on attenuated laser pulses, deterministic single-photon sources could give concrete advantages in terms of secret key rate (SKR) and security owing to the negligible probability of multi-photon events. Here, we introduce and demonstrate a proof-of-concept QKD system exploiting a molecule-based single-photon source operating at room temperature and emitting at 785nm. With an estimated SKR of 0.5 Mbps, our solution paves the way for room-temperature single-photon sources for quantum communication protocols.