Comment on "Neutron Interferometric Observation of Noncyclic Phase"

Details Comment on "Neutron Interferometric Observation of Noncyclic Phase" Comment on "Neutron Interferometric Observation of Noncyclic Phase"

1998-10-12

arxiv.org/abs/quant-ph/9810030v1

Phys.Rev.Lett. 83 (1999) 2089

Physics

Quantum Physics

5 pages, 0 figures, submitted to Phys.Rev.Lett

Scientific paper

10.1103/PhysRevLett.83.2089

A critique of a recent experiment [Wagh et.al., Phys.Rev.Lett.81, 1992 (7 Sep 1998)] to measure the noncyclic phase associated with a precessing neutron spin in a neutron interferometer, as given by the Pancharatnam criterion, is presented. It is pointed out that since the experiment measures, not the noncyclic phase itself, but a quantity derived from it, it misses the most interesting feature of such a phase, namely the different sign associated with states lying in the upper and the lower hemispheres, a feature originating in the existence of a phase singularity. Such effects have earlier been predicted and seen in optical interference experiments using polarization of light as the spinor [Bhandari, Phys.Rep.281, 1 (Mar 1997)].

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