Experimental realization of a momentum-space quantum walk

Siamak Dadras, Alexander Gresch, Caspar Groiseau, Sandro Wimberger, and Gil S. Summy
Phys. Rev. A 99, 043617 – Published 16 April 2019

Abstract

We report on a discrete-time quantum walk that uses the momentum of ultra-cold rubidium-87 atoms as the walk space and two internal atomic states as the coin degree of freedom. Each step of the walk consists of a coin toss (a microwave pulse) followed by a unitary shift operator (a resonant ratchet pulse). We carry out a comprehensive experimental study on the effects of various parameters, including the strength of the shift operation, coin parameters, noise, and initialization of the system on the behavior of the walk. The walk dynamics can be well controlled in our experiment; potential applications include atom interferometry and engineering asymmetric walks.

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  • Received 4 October 2018

DOI:https://doi.org/10.1103/PhysRevA.99.043617

©2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Siamak Dadras1, Alexander Gresch2, Caspar Groiseau3, Sandro Wimberger4,5,*, and Gil S. Summy1,†

  • 1Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078-3072, USA
  • 2Faculty of Mathematics and Natural Sciences, Heinrich Heine Universität Düsseldorf, 40225 Düsseldorf, Germany
  • 3Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
  • 4Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area delle Scienze 7/A, 43124 Parma, Italy
  • 5INFN, Sezione di Milano Bicocca, Gruppo Collegato di Parma, Parma, Italy

  • *sandromarcel.wimberger@unipr.it
  • gil.summy@okstate.edu

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Issue

Vol. 99, Iss. 4 — April 2019

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