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Realization of quantum walks with negligible decoherence in waveguide lattices

Perets, HB; Lahini, Y; Pozzi, F; Sorel, M; Morandotti, R; Silberberg, Y; (2008) Realization of quantum walks with negligible decoherence in waveguide lattices. PHYS REV LETT , 100 (17) , Article 170506. 10.1103/PhysRevLett.100.170506. Green open access

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Abstract

Quantum random walks are the quantum counterpart of classical random walks, and were recently studied in the context of quantum computation. Physical implementations of quantum walks have only been made in very small scale systems severely limited by decoherence. Here we show that the propagation of photons in waveguide lattices, which have been studied extensively in recent years, are essentially an implementation of quantum walks. Since waveguide lattices are easily constructed at large scales and display negligible decoherence, they can serve as an ideal and versatile experimental playground for the study of quantum walks and quantum algorithms. We experimentally observe quantum walks in large systems (similar to 100 sites) and confirm quantum walks effects which were studied theoretically, including ballistic propagation, disorder, and boundary related effects.

Type: Article
Title: Realization of quantum walks with negligible decoherence in waveguide lattices
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.100.170506
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.100.170506
Language: English
Additional information: © 2008 The American Physical Society
Keywords: PHOTONIC LATTICES, LOCALIZATION, DIFFUSION, SOLITONS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
URI: https://discovery.ucl.ac.uk/id/eprint/704720
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