Disentanglement--induced bistability in a magnetic resonator

TL;DR

This paper investigates multi-stability in a ferrimagnetic spin resonator, proposing that spontaneous disentanglement explains the observed phenomena better than traditional Bosonization methods, supported by experimental data.

Contribution

It introduces a disentanglement-based nonlinear master equation as an alternative to Bosonization for explaining multi-stability in magnetic resonators.

Findings

Disentanglement model aligns better with experimental data.

Traditional Bosonization approach has difficulties justifying multi-stability.

Spontaneous disentanglement may be a key factor in quantum system dynamics.

Abstract

Multi--stability in the response of a ferrimagnetic spin resonator to an externally applied driving is experimentally studied. The observed multi--stability cannot be derived from any master equation that linearly depends on the spins' reduced density operator. Traditionally, the nonlinearity that is required in order to theoretically account for the observed multi--stability is introduced by implementing the method of Bosonization. Here, an alternative explanation, which is based on the hypothesis that disentanglement spontaneously occurs in quantum systems is explored. According to this hypothesis, time evolution is governed by a master equation having an added nonlinear term, which deterministically generates disentanglement. Experimental results are compared with predictions derived from both competing theoretical models. It is found that better agreement with data is obtained from the disentanglement--based model. This finding, together with a difficulty to justify the Bosonization--based model, indirectly support the spontaneous disentanglement hypothesis.