# Enhanced Bell state measurement for efficient measurement-device-independent quantum key distribution using 3-dimensional quantum states

## TL;DR

This paper introduces an improved 3-dimensional Bell state measurement scheme that enhances the efficiency of measurement-device-independent quantum key distribution by increasing the sifted signal rate threefold using advanced interferometry and photon detection techniques.

## Contribution

It presents a novel 3-dimensional Bell state measurement method that significantly boosts the key distribution rate over existing setups.

## Key findings

- Sifted signal rate increased by up to three times.
- Utilizes multi-port interferometer and nondestructive photon measurements.
- Enhances discrimination of 3D entangled states.

## Abstract

We propose an enhanced discrimination measurement for tripartite 3-dimensional entangled states in order to improve the discernible number of orthogonal entangled states. The scheme suggests 3-dimensional Bell state measurement by exploiting composite two 3-dimensional state measurement setups. The setup relies on state-of-the-art techniques, a multi-port interferometer and nondestructive photon number measurements that are used for the post-selection of suitable ensembles. With this scheme, the sifted signal rate of measurement-device-independent quantum key distribution using 3-dimensional quantum states is improved by up to a factor of three compared with that of the best existing setup.