SSO Seminar, External Speaker.
Title: Coupling time-reversed systems: PT symmetry in quantum and classical domains
Abstract: Over the past decade, open systems undergoing coherent, non-unitary evolution have attracted tremendous attention. In the quantum case, it is due to non-Hermitian Hamiltonians that generate novel dynamics from exceptional-point (EP) degeneracies of their complex energies. In classical wave systems with PT-symmetric Hamiltonians, it is due to novel effects that includes enhanced sensitivity, topological transfer, and breakdown of bulk-boundary correspondence. I will present an overview of "non-Hermitian Physics" that covers quantum and classical realizations. I will show how their key surprising properties can be investigated using superconducting qubit , ultra cold atoms , quantum photonics , as well as electrical circuits, lasers, and shallow-water waves . Going beyond the linear regime, each realization allows us to address non-trivial physics arising from interactions, memory, time-delay, or non-linearities. I will conclude the talk with open areas where these ideas may break new ground, and the unique role played by young students in this field of research.
 Nature Physics 15, 1232 (2019) with Kater Murch group.
 Nature Communications 10, 855 (2019) with Le Luo group.
 Phys. Rev. Research 4, 013061 (2022); Nature 557, 660 (2018) with Anthony Laing group.
 with Roberto Leon Montiel group, Gautam Vemuri group, and Monica Garcia Nuestes group.