Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 44: Quantum Information (Concepts and Methods) III
Q 44.3: Vortrag
Donnerstag, 14. März 2019, 11:00–11:15, S HS 001 Chemie
Eigenvalue Measurement of Topologically Protected Edge states in Split-Step Quantum Walks — •Thomas Nitsche1, Tobias Geib2, Christoph Stahl2, Lennart Lorz1, Christopher Cedzich2,3, Sonja Barkhofen1, Reinhard F. Werner2, and Christine Silberhorn1 — 1Applied Physics, IQO, University of Paderborn, Warburger Str. 100, 33098 Paderborn, Germany — 2Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany — 3Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
We study topological phenomena of quantum walks by implementing a novel protocol that extends the range of accessible properties to the eigenvalues of the walk operator. To this end, we experimentally realise for the first time a split-step quantum walk with decoupling, which allows for investigating the effect of a bulk-boundary while realising only a single bulk configuration. We approximate the symmetry protected edge states with high similarities and read out the phase relative to a reference for all modes. In this way we observe eigenvalues which are distinguished by the presence or absence of sign flips between steps. Furthermore, the results show that investigating a bulk-boundary with a single bulk is experimentally feasible when decoupling the walk beforehand.