Phys. Rev. Lett. 104, 153602 (2010) [4 pages]Discrete Single-Photon Quantum Walks with Tunable DecoherenceReceived 25 February 2010; revised 18 March 2010; published 16 April 2010 Quantum walks have a host of applications, ranging from quantum computing to the simulation of biological systems. We present an intrinsically stable, deterministic implementation of discrete quantum walks with single photons in space. The number of optical elements required scales linearly with the number of steps. We measure walks with up to 6 steps and explore the quantum-to-classical transition by introducing tunable decoherence. Finally, we also investigate the effect of absorbing boundaries and show that decoherence significantly affects the probability of absorption. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.153602
DOI:
10.1103/PhysRevLett.104.153602
PACS:
42.50.Dv, 03.65.Yz, 05.40.Fb, 42.50.Xa
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