Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 10: Quantum Optics II
Q 10.3: Talk
Monday, February 29, 2016, 15:00–15:15, f442
Measuring topological invariants in photonic quantum walks — •Thomas Nitsche1, Fabian Elster1, Sonja Barkhofen1, Aurél Gábris2, Igor Jex2, and Christine Silberhorn1 — 1Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn — 2Department of Physics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehova 7, 11519 Praha, Czech Republic
Concepts such as topological insulators have sparked interest in the investigation of topological material properties. Here, we present the simulation of topological phenomena in a discrete-time quantum walk experiment.
In our implementation of a photonic quantum walk system, we are able to dynamically control the quantum-coin, making it feasible to implement a split-step quantum walk protocol simulating the interfacing of bulks with different topological properties.
Being able to read-out the external as well as the internal state of the walker, we measure reflection amplitudes directly corresponding to topological invariants. We show that by tuning the coin operation, we alter topological phases in our model system.