Parametric excitation of a ferrimagnetic sphere resonator

TL;DR

This paper experimentally investigates the response of a ferrimagnetic sphere resonator to parametric excitation and compares the results with a novel theoretical model that incorporates quantum disentanglement effects.

Contribution

It introduces a nonlinear master equation model based on quantum disentanglement to explain experimental phenomena in ferrimagnetic resonators.

Findings

Model agrees with experimental instability observations

Disentanglement-based model outperforms linear models

Qualitative match with experimental data

Abstract

The response of a ferrimagnetic sphere resonator to an externally applied parametric excitation is experimentally studied. Measurement results are compared with predictions derived from a theoretical model, which is based on the hypothesis that disentanglement spontaneously occurs in quantum systems. According to this hypothesis, time evolution is governed by a modified master equation having an added nonlinear term that deterministically generates disentanglement. It is found that the disentanglement--based model is compatible with the experimental results. In particular, the model can qualitatively account for an experimentally observed instability in the system under study, which cannot be derived from any theoretical model that is based on a linear master equation.