Publications in Scientific Journals:
Y. Hasegawa, K. Durstberger-Rennhofer, St. Sponar, H. Rauch:
"Kochen-Specker theorem studied with neutron interferometer";
Nuclear Instruments and Methods in Physics Research A,
The Kochen-Specker theorem shows the incompatibility of noncontextual hidden variable theories with quantum mechanics.Quantum contextuality is a more general concept than quantumnon-locality which is quite well tested in experiments using Bell inequalities. Within neutron interferometry we performed an experimental test of the Kochen-Specker theorem with an inequality, which identifies quantum contextuality, by using spin-path entanglement of single neutrons. Here entanglement is
achieved not between different particles, but between degrees of freedom of a single neutron, i.e.,
between spin and path degree of freedom. Appropriate combinations of the spin analysis and the
position of the phase shifter allow an experimental verification of the violation of an inequality derived
from the Kochen-Specker theorem. The observed violation 2.291 +-0.008 1 clearly shows that
quantum mechanical predictions cannot be reproduced by noncontextual hidden variable theories.
Neutron interferometer, Entanglement, Kochen-Specker theorem, Contextuality, Degrees of freedom
Electronic version of the publication:
Created from the Publication Database of the Vienna University of Technology.