In hybrid systems, two or more different degrees of freedom are coupled. Examples are optomagnonic systems, where light couples to magnetism, or electromechanical systems, where a current couples to mechanical vibrations. The coupled dynamics of these systems is usually highly nonlinear and very rich, giving rise to testbeds to study nonlinear dynamics both at the semiclassical and quantum level. When the time scales of the different degrees of freedom can be separated, it is possible to find equations of motion for one kind of degree of freedom which include the interaction with the other kind in an effective manner. This is a form of describing backaction. We study backaction and nonlinear dynamics for hybrid open quantum systems.
More information is provided in the following two papers: