Decoy-State Quantum Key Distribution with Nonclassical Light Generated in a One-dimensional Waveguide

TL;DR

This paper presents a decoy-state quantum key distribution scheme using a nonclassical light source generated in a one-dimensional waveguide, achieving higher key rates and robustness over traditional methods.

Contribution

It introduces a novel QKD approach utilizing a sub-Poissonian single-photon source in a waveguide, enhancing key rate and system robustness.

Findings

Two-fold increase in key generation rate compared to coherent state decoy-state QKD.

System performance remains robust against parameter variations and losses.

Demonstrates practical advantages of nonclassical light sources in QKD.

Abstract

We investigate a decoy-state quantum key distribution (QKD) scheme with a sub-Poissonian single-photon source, which is generated on demand by scattering a coherent state off a two-level system in a one-dimensional waveguide. We show that, compared to coherent state decoy-state QKD, there is a two-fold increase of the key generation rate. Furthermore, the performance is shown to be robust against both parameter variations and loss effects of the system.