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. 2011 May 6;106(18):180403.
doi: 10.1103/PhysRevLett.106.180403. Epub 2011 May 6.

Decoherence and disorder in quantum walks: from ballistic spread to localization

A Schreiber  1 , K N Cassemiro, V Potoček, A Gábris, I Jex, Ch Silberhorn
Affiliations

Decoherence and disorder in quantum walks: from ballistic spread to localization

A Schreiber et al. Phys Rev Lett. .

Abstract

We investigate the impact of decoherence and static disorder on the dynamics of quantum particles moving in a periodic lattice. Our experiment relies on the photonic implementation of a one-dimensional quantum walk. The pure quantum evolution is characterized by a ballistic spread of a photon's wave packet along 28 steps. By applying controlled time-dependent operations we simulate three different environmental influences on the system, resulting in a fast ballistic spread, a diffusive classical walk, and the first Anderson localization in a discrete quantum walk architecture.

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