Steady-State Multiparticle Entanglement via Dissipative Engineering in Waveguide QED

TL;DR

This paper introduces a scalable dissipative method to generate multiparticle entanglement in waveguide QED systems, leveraging collective effects and the quantum Zeno effect to reach steady states with high fidelity.

Contribution

It presents a novel, experimentally feasible scheme for deterministic multiparticle entanglement generation using dissipative dynamics in waveguide QED.

Findings

Entanglement fidelity improves with increased cooperativity.

The scheme is scalable to many emitters.

Experimental implementation with trapped Cs atoms is feasible.

Abstract

We propose a simple scheme for the dissipative generation of entangled states of multiple emitters coupled to a waveguide. Our approach exploits collective interactions arising from the formation of subradiant and superradiant excited states, combined with the quantum Zeno effect. We show that, starting from an arbitrary initial state, the system deterministically evolves toward a W-type entangled steady state, with an infidelity that scales inversely with the cooperativity. The protocol is scalable to an arbitrary number of emitters. We further analyze the impact of additional experimental imperfections and present a detailed implementation based on trapped $^{133}$Cs atoms.