# Scalable repeater architectures for multi-party states

## TL;DR

This paper proposes a scalable two-dimensional quantum repeater network architecture that efficiently distributes multi-party GHZ entangled states, overcoming limitations of traditional one-dimensional networks and suitable for real-world quantum communication.

## Contribution

It introduces a novel two-dimensional repeater scheme using atomic or solid state ensembles with built-in error filtering, enhancing scalability for multi-party quantum networks.

## Key findings

- Demonstrates robustness against excitation losses and dark counts
- Achieves improved scalability over one-dimensional networks
- Provides a feasible design for future multi-party quantum experiments

## Abstract

The vision to develop quantum networks entails multi-user applications, which require the generation of long-distance multi-party entangled states. The current rapid experimental progress in building prototype-networks calls for new design concepts to guide future developments. Here we describe an experimentally feasible scheme implementing a two-dimensional repeater network for robust distribution of three-party entangled states of GHZ type in the presence of excitation losses and detector dark counts --- the main sources of errors in real-world hardware. Our approach is based on atomic or solid state ensembles and employs built-in error filtering mechanisms peculiar to intrinsically two-dimensional networks. This allows us to overcome the performance limitation of conventional one-dimensional ensemble-based networks distributing multi-party entangled states and provides an efficient design for future experiments with a clear perspective in terms of scalability.