Aashish Clerk - Institute of Molecular Engineering, University of Chicago

Date: 
Thu, 01/17/2019 - 12:00pm
Location: 
705 Pupin Hall

 

"Bosonic analogues of topological superconductors"

Interest continues to grow in bosonic versions of topological electronic phases realized using photonic or phononic degrees of freedom.  These systems are typically 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 on a class of bosonic systems where this correspondence fails, and the bosonic system exhibits unique topological properties.  They involve using parametric “two-photon” driving, and have Hamiltonians that superficially resemble those of topological superconductors.  Among the surprising effects that emerge are the presence of topologically-protected instabilities that can be harnessed for non-reciprocal quantum amplification, and effective non-Hermitian dynamics in a bosonic analogue of the Kitaev-Majorana chain.  I’ll discuss how these ideas could be realized in a variety of different experimental platforms.

About the speaker

Professor Aashish Clerk's research focuses on theoretical quantum condensed matter physics & quantum optics, engineered quantum systems, quantum information physics.  His group is broadly interested in developing a theoretical understanding of phenomena in driven-dissipative quantum systems, with a particular focus on superconducting quantum circuits, quantum optomechanical systems, and quantum electronic transport.