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Photon-photon interactions in a waveguide with an array of atoms

Date: Wednesday, March 4, 2020 14:00 - 15:00
Speaker: Alexander N. Poddubny (Ioffe Institute, St. Petersburg)
Location: Foyer seminar room Ground floor / Office Bldg West (I21.EG.128)
Series: Physical Sciences Seminar
Host: Johannes Fink / Elena Redchenko
Contact: WIDDMANN Sandra


We study theoretically propagation of a photon pair in a one-dimensional waveguide with an embedded array of closely-spaced two-level atoms. We predict, that atom-mediated interaction between the two photons enables an unexpectedly rich variety of two-quantum states. This strikingly simple setup features interaction-induced localization [arXiv: 1911.04113, PRL (2020, in press)], quantum Hall phase with Landau levels, interaction-driven topological edge states and Hofstadter-like butterfly as well as signatures of quantum chaos.
Our findings enrich the understanding of many-body quantum matter and open new avenues to engineer entanglement by interactions.
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