title: Improvement of the polarized neutron interferometer setup demonstrating violation of a Bell-like inequality.
abstract: For precise measurements with polarised neutrons high efficient spin-manipulation is required. We developed several neutron optical elements suitable for a new sophisticated setup, i.e., DC spin-turners and Larmor-accelerators which diminish thermal disturbances and depolarisation considerably. The gain in performance is exploited demonstrating violation of a Bell-like inequality for a spin-path entangled single-neutron state. The obtained value of [Formula: see text], which is much higher than previous measurements by neutron interferometry, is [Formula: see text] above the limit ofS=2 predicted by contextual hidden variable theories. The new setup is more flexible referring to state preparation and analysis, therefore new, more precise measurements can be carried out.
authors.affiliation: Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria.
authors.forename: H
authors.initials: H
authors.lastname: Geppert
authors.affiliation: Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria.
authors.forename: T
authors.initials: T
authors.lastname: Denkmayr
authors.affiliation: Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria.
authors.forename: S
authors.initials: S
authors.lastname: Sponar
authors.affiliation: Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria ; Institut Laue Langevin, 38000 Grenoble, France.
authors.forename: H
authors.initials: H
authors.lastname: Lemmel
authors.affiliation: Atominstitut, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria.
authors.forename: Y
authors.initials: Y
authors.lastname: Hasegawa
keywords: Bell inequality; Neutron interferometry; Polarised neutrons; Quantum physics