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

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

2008-12-19

arxiv.org/abs/0812.3757v1

Phys.Rev.Lett.102:030404,2009

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.102.030404

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 ultra-cold 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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