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

Details Decoherence and disorder in quantum walks: From ballistic spread to localization Decoherence and disorder in quantum walks: From ballistic spread to localization

2011-01-13

arxiv.org/abs/1101.2638v1

Phys. Rev. Lett. 106, 180403 (2011)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.106.180403

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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