2009/10/31 by A. Schreiber, K. N. Cassemiro, V. Potocek +5 · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.104.050502
published as Phys. Rev. Lett. 104, 050502 (2010) · 4 pages, 4 figures
arxiv created 2010/02/09 · arxiv updated 2015/05/14
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.