Scalable Dissipative Preparation of Many-Body Entanglement

TL;DR

This paper introduces a scalable method for dissipatively creating highly entangled multiparticle states, such as GHZ states, in atomic systems coupled to common modes, with potential applications in various quantum platforms.

Contribution

The authors develop a general protocol combining local spontaneous emission and coherent couplings to efficiently generate multiparticle entanglement through dissipation.

Findings

High-fidelity GHZ states can be prepared in polynomial time

The method is robust to generic couplings

Feasibility demonstrated in trapped-ion systems

Abstract

We present a technique for the dissipative preparation of highly entangled multiparticle states of atoms coupled to common oscillator modes. By combining local spontaneous emission with coherent couplings we engineer many-body dissipation that drives the system from an arbitrary initial state into a Greenberger-Horne-Zeilinger state. We demonstrate that using our technique, highly entangled steady states can be prepared efficiently in a time that scales polynomially with the system size. Our protocol assumes generic couplings and will thus enable the dissipative production of multiparticle entanglement in a wide range of physical systems. As an example, we demonstrate the feasibility of our scheme in state-of-the-art trapped-ion systems.