Disentanglement-induced multistability

TL;DR

This paper demonstrates that a nonlinear master equation incorporating disentanglement effects can produce multistability in quantum spin systems, revealing phase transitions and instabilities that support the idea of spontaneous disentanglement.

Contribution

It introduces a nonlinear master equation model that explains multistability in quantum systems, linking disentanglement to complex dynamical behaviors.

Findings

Nonlinear term induces multistability in quantum spin systems

Phase transition observed under external magnetic field

Dynamical instability linked to disentanglement phenomena

Abstract

Multistability cannot be derived from any theoretical model that is based on a monostable master equation. On the other hand, multistability is experimentally-observed in a variety of quantum systems. A master equation having a nonlinear term that gives rise to disentanglement has been recently proposed . The dynamics governed by this master equation is explored for a quantum system made of coupled spins. It is found that the added nonlinear term can give rise to multistability. The spins' response to an externally applied magnetic field is evaluated, and both a phase transition and a dynamical instability are found. These findings, which originate from disentanglement-induced multistability, indirectly support the hypothesis that spontaneous disentanglement occurs in quantum systems.