Dispersion Pre-compensation in Asymmetric Measurement Device Independent Quantum Key Distribution for Improved Secret Key Generation

TL;DR

This paper proposes a dispersion pre-compensation method using modulators in asymmetric MDI-QKD to improve key rates and extend communication distances without extra fiber losses.

Contribution

It introduces a novel dispersion compensation technique that avoids DCF losses, significantly enhancing the performance of asymmetric MDI-QKD systems.

Findings

Increased secret key rates in asymmetric channels

Extended communication distances achieved

Reduced losses compared to traditional DCF methods

Abstract

In Measurement-Device-Independent Quantum Key Distribution (MDI-QKD), key rates are significantly reduced due to dispersion in asymmetric channels. This work addresses this issue by utilizing intensity and phase modulators for dispersion compensation, thus avoiding the additional losses associated with dispersion-compensating fibers (DCFs). This approach enhances key rates and enables longer communication distances.