Superconducting cavity piezo-electromechanics: the realization of an acoustic frequency comb at microwave frequencies

TL;DR

This paper demonstrates a superconducting electroacoustic system that uses Kerr nonlinearity to generate a microwave-frequency acoustic comb, enabling advanced control of multimode resonators.

Contribution

It introduces a novel multimode superconducting electroacoustic system with Kerr nonlinearity, leading to the first demonstration of a microwave-frequency acoustic comb.

Findings

Achieved multimode Kerr nonlinearity at 10 GHz

Generated a coherent microwave-frequency acoustic comb

Provided theoretical insights into multimode nonlinear interactions

Abstract

We present a nonlinear multimode superconducting electroacoustic system, where the interplay between superconducting kinetic inductance and piezoelectric strong coupling establishes an effective Kerr nonlinearity among multiple acoustic modes at 10 GHz that could hardly be achieved via intrinsic mechanical nonlinearity. By exciting this multimode Kerr system with a single microwave tone, we further demonstrate a coherent electroacoustic frequency comb and provide theoretical understanding of multimode nonlinear interaction in the superstrong coupling limit. This nonlinear superconducting electroacoustic system sheds light on the active control of multimode resonator systems and offers an enabling platform for the dynamic study of microcombs at microwave frequencies.