Quantum Optics of Chiral Spin Networks

TL;DR

This paper investigates how chiral spin networks coupled to 1D waveguides can generate multipartite entangled steady states through driven-dissipative dynamics, highlighting the role of asymmetric coupling and collective decay.

Contribution

It introduces a framework for understanding entanglement formation in chiral spin networks driven by asymmetric coupling to waveguides, with potential experimental implementations.

Findings

Asymmetric coupling enables pure multipartite entangled steady states.

Collective decay processes are crucial for entanglement generation.

Multipartite entanglement characterized by Fisher information.

Abstract

We study the driven-dissipative dynamics of a network of spin-1/2 systems coupled to one or more chiral 1D bosonic waveguides within the framework of a Markovian master equation. We determine how the interplay between a coherent drive and collective decay processes can lead to the formation of pure multipartite entangled steady states. The key ingredient for the emergence of these many-body dark states is an asymmetric coupling of the spins to left and right propagating guided modes. Such systems are motived by experimental possibilities with internal states of atoms coupled to optical fibers, or motional states of trapped atoms coupled to a spin-orbit coupled Bose-Einstein condensate. We discuss the characterization of the emerging multipartite entanglement in this system in terms of the Fisher information.