Experimental Demonstration of the Stability of Berry’s Phase for a Spin-1/2 Particle

S. Filipp, J. Klepp, Y. Hasegawa, C. Plonka-Spehr, U. Schmidt, P. Geltenbort, and H. Rauch
Phys. Rev. Lett. 102, 030404 – Published 22 January 2009

Abstract

The geometric phase has been proposed as a candidate for noise resilient coherent manipulation of fragile quantum systems. Since it is determined only by the path of the quantum state, the presence of noise fluctuations affects the geometric phase in a different way than the dynamical phase. We have experimentally tested the robustness of Berry’s geometric phase for spin-1/2 particles in a cyclically varying magnetic field. Using trapped polarized ultracold neutrons, it is demonstrated that the geometric phase contributions to dephasing due to adiabatic field fluctuations vanish for long evolution times.

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  • Received 25 August 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.030404

©2009 American Physical Society

Authors & Affiliations

S. Filipp1,2,3,*, J. Klepp1,3, Y. Hasegawa1, C. Plonka-Spehr3, U. Schmidt4, P. Geltenbort3, and H. Rauch1

  • 1Atominstitut der Österreichischen Universitäten, Stadionallee 2, A-1020 Vienna, Austria
  • 2Department of Physics, ETH Zurich, CH-8093 Zürich, Switzerland
  • 3Institut Laue Langevin, Boîte Postale 156, F-38042 Grenoble Cedex 9, France
  • 4Physikalisches Institut, Philosophenweg 12, 69120 Heidelberg, Germany

  • *filipp@phys.ethz.ch

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Vol. 102, Iss. 3 — 23 January 2009

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