Photonic Analogues of Topological Superconductors

Dr. Aashish Clerk (hosted by Kater Murch), Institute for Molecular Engineering, University of Chicago, Illinois
October 23, 2017 at 4:00 pm
241 Compton
Event Description 

Interest continues to grow in photonic analogues of topological electronic phases.  In most cases, these systems are non-interacting, and have the same band structure and edge state structure as their fermionic counterparts.  In this talk, I’ll discuss recent theory work in my group showing how parametric “two-photon” driving can be used to realize a new class of photonic topological systems that superficially resemble topological superconductors.  Unlike standard particle-number conserving models of non-interacting topological phases, these new systems exhibit crucial differences between their bosonic and fermionic versions.  Further, one can realize a situation where all bulk states are stable, but where edge states are guaranteed to be unstable.  Such a system can form the basis of a useful device:  a topologically-protected amplifier which operates close to the fundamental limits set by quantum mechanics.  I’ll discuss how these ideas could be realized in a variety of different experimental platforms, including superconducting quantum circuits and optomechanics.

Coffee:  3:45 pm, 241 Compton