Photons walking the line: A quantum walk with adjustable coin operations

A. Schreiber, K. N. Cassemiro, V. Potoček, A. Gábris, P. J. Mosley, E. Andersson, I. Jex, Ch Silberhorn

Research output: Contribution to journalArticlepeer-review

498 Citations (Scopus)


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, opening the way for the implementation of a quantum-walk-based search algorithm. © 2010 The American Physical Society.

Original languageEnglish
Article number050502
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 4 Feb 2010


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