Optimizing QKD efficiency by addressing chromatic dispersion and time measurement uncertainty

TL;DR

This paper introduces a QKD protocol that mitigates chromatic dispersion and measurement uncertainties, significantly improving key rates and secure communication range in practical quantum networks.

Contribution

It presents a novel approach to optimize QKD efficiency by controlling photon chirp, addressing real-world physical challenges for more robust quantum communication.

Findings

Enhanced key generation rates achieved

Extended secure communication distances demonstrated

Practical strategies for real-world QKD implementation

Abstract

In this paper, we present a Quantum Key Distribution (QKD) protocol that accounts for fundamental practical challenges, including chromatic dispersion, time measurement uncertainty, and dark counts. Our analysis provides a comprehensive framework for understanding the impact of these physical phenomena on QKD efficiency, offering practical strategies for enhancing the robustness and security of quantum communication systems in real-world applications. In particular, by manipulating the chirp parameter of single-photon wave packets, we demonstrate significant improvements in key generation rates and an extended range of secure communication.