PIRSA:23020014 Scientific Series Condensed Matter

DOI10.48660/23020014

Series: Quantum Matter

Joglekar, Y. (2023). A lossy atom that does not decay: PT symmetry and coherent dynamics with complex energies. Perimeter Institute. https://pirsa.org/23020014

Joglekar, Yogesh. A lossy atom that does not decay: PT symmetry and coherent dynamics with complex energies. Perimeter Institute, Feb. 14, 2023, https://pirsa.org/23020014 

@misc{ pirsa_PIRSA:23020014,
  doi = {10.48660/23020014},
  url = {https://pirsa.org/23020014},
  author = {Joglekar, Yogesh},
  keywords = {Condensed Matter},
  language = {en},
  title = {A lossy atom that does not decay: PT symmetry and coherent dynamics with complex energies},
  publisher = {Perimeter Institute},
  year = {2023},
  month = {feb},
  note = {PIRSA:23020014 see, \url{https://pirsa.org}}
}

Abstract

Isolated quantum systems, investigated a century ago, exhibit coherent, unitary dynamics. When such a system is coupled to an environment, the resulting loss of coherence is modeled by completely positive, trace preserving (CPTP) quantum maps for the density matrix. A lossy atom, when it has not decayed, exhibits a coherent dynamics that is in a distinct, new class. Non-Hermitian Hamiltonians with parity-time symmetry govern this class and exhibit exceptional-point (EP) degeneracies with topological features. After a historical introduction to PT symmetry, I will present examples of coherent, quantum dynamics in the static and Floquet regimes for such systems with a superconducting transmon (Nature Phys. 15, 1232 (2019)), ultracold atoms (Nature Comm. 10, 855 (2019)), and integrated quantum photonics (Phys. Rev. Res. 4, 013051 (2022); Nature 557, 660 (2018)) as platforms. These include topological quantum state transfer, entanglement/coherence control, and super-quantum correlations. I will conclude with speculations on applicability of these ideas to quantum matter, particle physics, and strong gravity. 

(* with Anthony Laing group, Kater Murch group, Le Luo group, Sourin Das group).

Zoom link:  https://pitp.zoom.us/j/92391441075?pwd=QmRYSnYveUZCci9QZFcwUHBFS29QZz09

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