# Improved Measurement-Device-Independent Quantum Key Distribution with Uncharacterized Qubits

## TL;DR

This paper presents an improved method for measurement-device-independent quantum key distribution that enhances key rates by better bounding error rates with uncharacterized qubits, supported by simulation results.

## Contribution

It introduces a new bound for error rate differences in MDI-QKD with uncharacterized qubits, leading to higher key rates.

## Key findings

- Key rates are significantly increased with the new bound.
- Simulations confirm improved performance over previous bounds.
- Enhanced security assumptions for uncharacterized qubits.

## Abstract

We propose an improved bound for the difference between phase and bit error rate in measurement-device-independent quantum key distribution with uncharacterized qubits. We show by simulations that the bound considerably increases the final key rates.