Perspective on witnessing entanglement in hybrid quantum systems

TL;DR

This paper reviews the theoretical approaches and proposes a new scheme to generate and detect entanglement in hybrid quantum systems, specifically involving superconducting circuits and solid-state spins, to rigorously test their quantum nature.

Contribution

It introduces a novel scheme for entanglement generation and detection in hybrid quantum systems, advancing experimental verification of quantum properties.

Findings

Theoretical analysis of entanglement generation methods

Proposed scheme for entanglement detection in hybrid systems

Discussion on experimental feasibility and implications

Abstract

Hybrid quantum systems aim at combining the advantages of different physical systems and to produce novel quantum devices. In particular, the hybrid combination of superconducting circuits and spins in solid-state crystals is a versatile platform to explore many quantum electrodynamics problems. Recently, the remote coupling of nitrogen-vacancy center spins in diamond via a superconducting bus was demonstrated. However, a rigorous experimental test of the quantum nature of this hybrid system and in particular entanglement is still missing. We review the theoretical ideas to generate and detect entanglement, and present our own scheme to achieve this.