Novel nonlinear collective effects in hybrid quantum systems: Relaxation to negative temperatures

Nonlinear systems are well known to exhibit many interesting and important phenomena that have profoundly changed our technological landscape over the last century. Recently our developments in quantum technologies has given us the ability to engineer systems through with no natural analog. We are now at the stage where we can explore nonlinear effect in quantum hybrid systems. In this presentation, we illustrate how these nonlinear effects allow the exploration of novel effects such as superradiance induced negative temperature relaxation.