Photons Walking the Line: A quantum walk with adjustable coin operations

Details Photons Walking the Line: A quantum walk with adjustable coin operations Photons Walking the Line: A quantum walk with adjustable coin operations

2009-10-12

arxiv.org/abs/0910.2197v2

Phys. Rev. Lett. 104, 050502 (2010)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

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 many different coin settings and initial states, which opens the way for the implementation of a quantum walk-based search algorithm.

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