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

A Schreiber, K N Cassemiro, V Potoček, A Gábris, Peter James Mosley, E Andersson, I Jex, Ch Silberhorn

Research output: Contribution to journalArticlepeer-review

491 Citations (SciVal)


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.
Original languageEnglish
Article number050502
Number of pages4
JournalPhysical Review Letters
Issue number5
Early online date4 Feb 2010
Publication statusPublished - 5 Feb 2010


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