Experiment on Interaction-Free Measurement in Neutron Interferometry

Abstract

A neutron interferometric test of interaction-free detection of the presence of an absorbing object in one arm of a neutron interferometer has been performed. Despite deviations from the ideal performance characteristics of a Mach-Zehnder interferometer it could be shown that information is obtained without interaction.Comment: 8 pages, 4 postscript figures; submitted to Phys.Lett.A; Figures contained only in replaced versio