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Journal Article

Photons Walking the Line: A Quantum Walk with Adjustable Coin Operations

MPS-Authors
/persons/resource/persons201185

Schreiber,  A.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201029

Cassemiro,  K. N.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201134

Mosley,  P. J.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201196

Silberhorn,  Ch.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Schreiber, A., Cassemiro, K. N., Potocek, V., Gabris, A., Mosley, P. J., Andersson, E., et al. (2010). Photons Walking the Line: A Quantum Walk with Adjustable Coin Operations. PHYSICAL REVIEW LETTERS, 104(5): 050502. doi:10.1103/PhysRevLett.104.050502.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6B31-0
Abstract
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.