# $N$ identical particles and one particle to entangle them all

## TL;DR

This paper proposes a universal, scalable scheme for generating W states of multiple particles using a single ancilla particle, exploiting quantum indistinguishability for both bosons and fermions.

## Contribution

It introduces a novel, simple method for creating multipartite entanglement that leverages spatial indistinguishability, applicable to different particle types without major modifications.

## Key findings

- Scheme is scalable and universal.
- Applicable to both bosons and fermions.
- Provides a new paradigm for entanglement generation.

## Abstract

In quantum information W states are a central class of multipartite entangled states because of their robustness against noise and use in many quantum processes. Their generation however remains a demanding task whose difficulty increases with the number of particles. We report a simple scalable conceptual scheme where a single particle in an ancilla mode works as entanglement catalyst of W state for other $N$ separated identical particles. A crucial novel aspect of the scheme, which exploits basically spatial indistinguishability, is its universality, being applicable without essential changes to both bosons and fermions. Our proposal represents a new paradigm within experimental preparation of many-particle entanglement based on quantum indistinguishability.