Stochastic Modeling of a Memory-Assisted Measurement-Device-Independent Quantum Key Distribution System in Free-Space Metropolitan Environments

TL;DR

This paper introduces a stochastic model for predicting key distribution rates in metropolitan free-space MA-MDI-QKD systems, accounting for real-world atmospheric and quantum memory parameters, aiding practical deployment.

Contribution

The paper presents a novel stochastic modeling approach specifically tailored for free-space MA-MDI-QKD systems in urban environments, incorporating quantum memory effects and atmospheric conditions.

Findings

Predicts key rates over 10-50 km ranges in urban settings.

Shows the impact of quantum memory efficiencies and coherence times.

Provides a practical tool for optimizing quantum communication networks.

Abstract

On the pathway to quantum key distribution on a global scale, will be the realization of metropolitan-sized Memory Assisted Measurement-Device-Independent Quantum Key Distribution (MA-MDI-QKD) systems. Here, we present a simplistic and intuitive stochastic model to predict key distribution rates in a MA-MDI-QKD scheme that addresses the real-world parameters inherent to free-space quantum communication channels. Specific to our algorithm, the memory-assisted based system allows us to leverage the advantage of asynchronously loaded quantum memory when predicting the distribution rates. Specifically, by focusing on metropolitan distances, we perform simulations tailored toward a system based on free-space links and field-deployable quantum memory. We show the capabilities of our model to predict key rate distributions over ranges of 10-50 km for a set of atmospheric-based parameters and selection of QM efficiencies and coherence times. This tool provides impactful insights into the deployment and optimization of practical MA-MDI-QKD networks in urban environments. Our streamlined approach is a valuable addition to existing quantum network simulators for the smooth integration of quantum networking into the field of communications engineering.