Modulated Electromechanics: Large Enhancements of Nonlinearities

TL;DR

This paper demonstrates that modulating the nonlinear coupling in electromechanical systems significantly enhances Kerr-nonlinearity and photon-pressure effects, enabling stronger nonlinear interactions in superconducting or optical cavities.

Contribution

The paper introduces a method to substantially increase nonlinearities in electromechanical systems through modulation of the coupling strength, with a practical circuit implementation.

Findings

Enhanced Kerr-nonlinearity by modulation

Increased photon-pressure force effects

Practical electromechanical circuit design

Abstract

It is well-known that the nonlinear coupling between a mechanical oscillator and a superconducting oscillator or optical cavity can be used to generate a Kerr-nonlinearity for the cavity mode. We show that the strength of this Kerr-nonlinearity, as well as the effect of the photon-pressure force can be enormously increased by modulating the strength of the nonlinear coupling. We present an electromechanical circuit in which this enhancement can be readily realized.