Off-diagonal geometric phases acquired in the evolution of a spin-1/2 system have been investigated by means of a polarized neutron interferometer. Final counts with and without polarization analysis enable us to observe simultaneously the off-diagonal and diagonal geometric phases in two detectors. We have quantitatively measured the off-diagonal geometric phase for noncyclic evolutions, confirming the theoretical predictions. We discuss the significance of our experiment in terms of geometric phases (both diagonal and off- diagonal) and in terms of the quantum-erasing phenomenon.
Observation of off-diagonal geometric phases in polarized-neutron-interferometer experiments / Y. Hasegawa, R. Loidl, G. Badurek, M. Baron, N. Manini, F. Pistolesi, H. Rauch. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 65:5(2002), pp. 052111.1-052111.10.
Observation of off-diagonal geometric phases in polarized-neutron-interferometer experiments
N. Manini;
2002
Abstract
Off-diagonal geometric phases acquired in the evolution of a spin-1/2 system have been investigated by means of a polarized neutron interferometer. Final counts with and without polarization analysis enable us to observe simultaneously the off-diagonal and diagonal geometric phases in two detectors. We have quantitatively measured the off-diagonal geometric phase for noncyclic evolutions, confirming the theoretical predictions. We discuss the significance of our experiment in terms of geometric phases (both diagonal and off- diagonal) and in terms of the quantum-erasing phenomenon.
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