Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 36: Photonics II

Q 36.6: Talk

Wednesday, March 13, 2019, 15:15–15:30, S Gr. HS Maschb.

Time-multiplexed photonic quantum walks with 4D coins — •Lennart Lorz¹, Evan Meyer-Scott¹, Thomas Nitsche¹, Václav Potocek², Aurél Gábris², Sonja Barkhofen¹, Igor Jex², and Christine Silberhorn¹ — ¹Integrated Quantum Optics, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — ²Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehová 7, 115 19, Praha 1, Czech Republic

Discrete time quantum walks, realized in time-multiplexed architectures, are an essential tool to experimentally study quantum transport phenomena. We have implemented the well-established time-multiplexing scheme in a Michelson interferometer loop, in contrast to the standard Mach-Zehnder setup. By exploiting the two different traveling directions in the loop in addition to the two possible polarizations of the walker, we devise a four dimensional coin space for a one dimensional quantum walk. Making use of the extra degrees of freedom, we are able to generate quantum walks on loop structures of various sizes and topologies, with mixing and non-mixing coins and different input positions and polarizations. By capitalizing on the full dimensionality of the coin, we demonstrate walk evolutions on so-called figure of eight graphs consisting of two loops connected by a central vertex of rank four.