Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 59: Quantum Effects: Interference and Correlations

Q 59.4: Vortrag

Freitag, 18. März 2011, 11:15–11:30, SCH A01

Decoherence effects in quantum walks: From ballistic spread to localization — •Andreas Schreiber¹, Katiúscia N. Cassemiro¹, Václav Potocek², Aurél Gábris², Igor Jex², and Christine Silberhorn^1,3 — ¹MPI for the Science of Light, IQO Group, Erlangen, Germany. — ²Department of Physics, FNSPE, Czech Technical University in Prague, Praha, Czech Republic. — ³University of Paderborn, Applied Physics, Paderborn, Germany.

Quantum walks describe the evolution of quantum particles in a discretized environment. This universal model serves not only as an explanation for coherent procedures in nature, like the energy transport in photosynthesis, but also offers a foundation for a new type of quantum computing. In both scenarios it is crucial to investigate the impact of decoherence on the system.

Here we present an all optical implementation of an one-dimensional quantum walk with a controllable source of decoherence. We demonstrate a fully coherent spread of a photon’s wavepacket in a quantum walk of up to 28 steps. Furthermore, we generated three classes of decoherence, changing the evolution to a fast ballistic quantum walk, a diffusive classical walk and the first Anderson localization in a discrete quantum walk architecture.