Quantum Optics Seminar by David Mason

Exceptional Points in an Optomechanical System

Exceptional points (EPs) are degeneracies occuring in open systems described by complex eigenvalues.  Near an EP, the system eigenvalues exhibit a topological structure that leads to interesting behavior with respect to closed adiabatic cycles.  Here, I will present our work on exploring EP phenomena in an optomechanical system.  Using nearly-degenerate mechanical modes of a Si3N4 membrane, we demonstrate energy transfer via encircling of an EP, as well as non-reciprocal behavior arising from a breakdown of adiabaticity.  I'll also discuss recent work on achieving the same physics with non-degenerate modes, using a bichromatic drive scheme.