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; H. Rauch

doi:10.1103/PhysRevLett.102.030404

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, H. Rauch

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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.

Original language	English
Article number	030404
Journal	Physical Review Letters
Volume	102
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.102.030404
State	Published - 20 Jan 2009
Externally published	Yes

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AU - Geltenbort, P.

AU - Rauch, H.

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Experimental demonstration of the stability of Berry's phase for a Spin-1/2 particle

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