Fundamentals and Applications of Hybrid Electro- and Opto-mechanical system coupled to Superconducting Qubit: A Short Review

TL;DR

This review discusses hybrid superconducting quantum systems involving mechanical resonators and optical interfaces, highlighting coupling mechanisms, architectures, and potential applications in sensors and quantum technologies.

Contribution

It provides a unified overview of qubit-mechanical and qubit-mechanical-optical hybrid systems, focusing on coupling mechanisms and system architectures.

Findings

Overview of coupling mechanisms via phase and charge interactions.

Discussion of transmon and fluxonium qubit platforms.

Extension to electro-optomechanical architectures for optical interfacing.

Abstract

Superconducting qubits, realized by incorporating Josephson junctions into superconducting circuits, behave as artificial atoms with anharmonic energy spectra and can be precisely controlled and measured using microwave cavities within the framework of circuit quantum electrodynamics (cQED). Since its emergence in the early 2000s, cQED has established superconducting qubits as leading candidates for scalable quantum devices and has enabled the exploration of hybrid quantum systems that integrate disparate physical platformsThis review surveys superconducting hybrid quantum electromechanical systems in which mechanical resonators are coupled to superconducting qubits, with a focus on two widely used qubit platforms: the transmon and the fluxonium. We provide an overview of the underlying coupling mechanisms arising from interactions through the phase and charge degrees of freedom of the qubit, and discuss how these mechanisms give rise to both longitudinal and transverse qubit-mechanical interactions. We further review extensions of electromechanical platforms to electro-optomechanical architectures, in which optical cavities are integrated to enable coherent interfacing between superconducting circuits and optical photons. This review aims to present a unified framework and perspective on qubit-mechanical and qubit-mechanical-optical hybrid systems in superconducting quantum technologies and applications related to sensors.