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Coupling time-reversed systems: PT symmetry in quantum and classical domains

Coupling time-reversed systems: PT symmetry in quantum and classical domains

Wednesday, October 12, 2022 at 4:00 pm
328 Weniger
Prof. Yogesh Joglekar, Indiana University–Purdue University Indianapolis

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 include 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 [1], ultra cold atoms [2], quantum photonics [3], as well as electrical circuits, lasers, and shallow-water waves [4]. 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.

[1] Nature Physics 15, 1232 (2019) with Kater Murch group.
[2] Nature Communications 10, 855 (2019) with Le Luo group.
[3] Phys. Rev. Research 4, 013061 (2022); Nature 557, 660 (2018) with Anthony Laing group.
[4] with Roberto Leon Montiel group, Gautam Vemuri group, and Monica Garcia Nuestes group.

Bio: Yogesh is a theoretical physicist and Professor at UIPUI with interests in graphene, PT-waveguides, memristors, and mathematics. Here is a Q&A in Nature about it. His research interest include PT-symmetric lattice models, Excitonic supersolid and superfluid states in quantum Hall regime and graphene, and memristive systems.

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