Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 1: Quantum Effects: Light Scattering and Propagation I / Interference and Correlations I
Q 1.3: Talk
Monday, March 8, 2010, 14:30–14:45, A 310
Photons Walking the Line: Quantum Walk with adjustable Coin Operations — •Andreas Schreiber1, Katiuscia Cassemiro1, Vaclav Potocek2, Aurel Gabris2, Peter J. Mosley1, Erika Andersson3, Igor Jex2, and Christine Silberhorn1 — 1MPI for the Science of Light, IQO Group, Erlangen, Germany. — 2Department of Physics, FNSPE, Czech Technical University in Prague, Praha, Czech Republic. — 3SUPA, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, United Kingdom.
A major topic in the field of quantum information is the development and investigation of quantum algorithms. Recent works have shown that the quantum analogue of a well known model in natural science, namely random walks, constitute a universal platform for performing computation.
Towards this application we present the first robust implementation of a coined quantum walk over five steps using only passive optical elements. By employing a fiber network loop we keep the amount of required resources constant as the walker’s position Hilbert space is increased. We observed a non-Gaussian distribution of the walker’s final position, thus characterizing a faster spread of the photon wave-packet in comparison to the classical random walk. The walk is realized for different coin settings and initial states, which opens the way for the implementation of a quantum walk-based search algorithm.