Engineering long-lived entanglement through dissipation in quantum hybrid solid-state platforms

TL;DR

This paper proposes a method to generate long-lasting spin squeezing and entanglement in solid-state qubit ensembles by leveraging quantum correlations in a squeezed solid-state bath, with potential for robust quantum technologies.

Contribution

It introduces a novel scheme for achieving steady-state spin squeezing in solid-state systems via dissipation and bath engineering, expanding quantum entanglement methods.

Findings

Ensemble can exhibit steady-state spin squeezing under specific conditions.

Quantum correlations in the bath can be transferred to the qubit array.

Feasibility demonstrated through analysis of spin defects coupled to a ferromagnetic bath.

Abstract

Spin squeezing, a form of many-body entanglement, is a crucial resource in quantum metrology and information processing. While experimentally viable protocols for generating stable spin squeezing have been proposed in quantum optics setups, there is growing interest in quantum hybrid solid-state systems as alternative platforms for both engineering and exploring many-body quantum phenomena. In this work, we propose a scheme to generate long-lived spin squeezing in an ensemble of solid-state qubits interacting with electromagnetic noise emitted by a squeezed solid-state bath. We identify the conditions under which quantum correlations within the bath can be transferred to the qubit array, driving it into an entangled state independently of its initial configuration. To assess the experimental feasibility of our approach, we analyze the dynamics of an array of solid-state spin defects coupled to a common ferromagnetic bath, which is driven into a non-equilibrium squeezed state through its interaction with a surface acoustic wave mode. Our results demonstrate that the ensemble can exhibit steady-state spin squeezing under suitable conditions, opening new pathways for the generation of robust many-body entanglement in solid-state spin ensembles.