SKM 2021 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 2: Quantum Chaos
DY 2.1: Invited Talk
Tuesday, September 28, 2021, 10:00–10:30, H6
Local Versus Global Two-Photon Interference in Quantum Networks — •Sonja Barkhofen1, Thomas Nitsche1, Syamsundar De1, Evan Meyer-Scott1, Johannes Tiedau1, Jan Sperling1, Aurél Gábris2,3, Igor Jex2, and Christine Silberhorn1 — 1Applied Physics, University of Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany — 2Department of Physics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehová 7, 115 19 Praha 1-Stare Mesto, Czech Republic — 3Wigner Research Centre for Physics, Konkoly-Thege M. út 29-33, H-1121 Budapest, Hungary
We devise an approach to characterizing the intricate interplay between classical and quantum interference of two-photon states in a network, which comprises multiple time-bin modes. By controlling the phases of delocalized single photons, we manipulate the global mode structure, resulting in distinct two- photon interference phenomena for time-bin resolved (local) and time-bucket (global) coincidence detection. This coherent control over the photons' mode structure allows for synthesizing two-photon interference patterns, where local measurements yield standard Hong-Ou-Mandel dips while the global two-photon visibility is governed by the overlap of the delocalized single-photon states. Thus, our experiment introduces a method for engineering distributed quantum interferences in networks.