Improved noise resistance analysis for path-entangled subspace quantum key distribution

TL;DR

This paper refines the noise robustness analysis of a high-dimensional path-entangled quantum key distribution protocol, considering various channel noise types and asymmetric scenarios, providing a versatile framework for comparison.

Contribution

It introduces an improved noise robustness analysis method for high-dimensional quantum key distribution, including asymmetric scenarios and simulation of different channel noise effects.

Findings

Enhanced understanding of noise effects on quantum key distribution

Framework applicable to various experimental platforms

Comparison of different noise scenarios

Abstract

We revisit the practical implementation of high-dimensional quantum key distribution protocol using path entanglement reported in [Phys.Rev.Lett.~127,~110505,~2021]. Here we refine the noise robustness analysis performed there by simulating the effect of different types of channel noise on the noiseless experimental data. Further, we extend the analysis to two kinds of asymmetric scenarios. In the first scenario the entanglement source is placed in Alice's lab and thus Only one noisy channel has to be considered. In the second scenario, Bob's detectors are placed at different physical locations and therefore such scenario implements a simple communication network. Our analysis can also be extended to other experimental platforms and therefore provides a novel framework for fair noise robustness comparison of high-dimensional quantum key distribution protocols.