Discrete Single-Photon Quantum Walks with Tunable Decoherence

M. A. Broome, A. Fedrizzi, B. P. Lanyon, I. Kassal, A. Aspuru-Guzik, A. G. White

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Abstract

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.

Original languageEnglish
Article number153602
Number of pages4
JournalPhysical Review Letters
Volume104
Issue number15
DOIs
Publication statusPublished - 16 Apr 2010

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