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Quantum Information and Measurement (QIM)

Experimental Realization of an Innovative Phase-Stable Bulk-Optic Scheme for Quantum Walks

Andrea Geraldi, Luós Diego Bonavena, Carlo Liorni, Paolo Mataloni, Álvaro Cuevas

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We present a bulk-optics setup for discrete quantum walks, based on a novel multipass displaced Sagnac geometry. It is phase stable, reconfigurable and allows to meausure the output radiation at each step. The experimental results of both ordered and disordered one-particle evolutions are reported.
DOI
10.1364/qim.2019.f5a.73

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We put forward a versatile and highly scalable experimental setup for the realization of discrete two-dimensional quantum random walks with a single-qubit coin and tunable degree of decoherence. The proposed scheme makes use of a small number of simple optical components arranged in a multipath Mach-Zehnder-like configuration, where a weak coherent state is injected. Environmental effects (decoherence) are generated by a spatial light modulator, which introduces pure dephasing in the transverse spatial plane perpendicular to the direction of propagation of the light beam. By controlling the characteristics of this dephasing, one can explore a great variety of scenarios of quantum random walks: pure quantum evolution (ballistic spread), fast fluctuating environment leading to a diffusive classical random walk, and static disorder resulting in the observation of Anderson localization.
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