2009/07/28 by Stephan Sponar, S. Sponar, Jürgen Klepp +13 · 1 citation
Computer Science · Physics and Astronomy · #Atomic and Subatomic Physics Research #Bell test experiments #Bell's theorem #Function (biology) #Geometric phase #Interferometry #Phase (matter) #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum mechanics #Spin (aerodynamics) #quant-ph
paper · pdf · doi:10.1103/physreva.81.042113
published as Phys. Rev. A 81, 042113 (2010) · 10 pages 9 figures
arxiv created 2009/07/28 · openalex publication_date 2010/04/30 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The influence of the geometric phase on a Bell measurement, as proposed by Bertlmann et al. [Phys. Rev. A 69, 032112 (2004)] and expressed by the Clauser-Horne-Shimony-Holt (CHSH) inequality, has been observed for a spin-path-entangled neutron state in an interferometric setup. It is experimentally demonstrated that the effect of geometric phase can be balanced by a change in Bell angles. The geometric phase is acquired during a time-dependent interaction with a radiofrequency field. Two schemes, polar and azimuthal adjustment of the Bell angles, are realized and analyzed in detail. The former scheme yields a sinusoidal oscillation of the correlation function S, dependent on the geometric phase, such that it varies in the range between 2 and 2√(2) and therefore always exceeds the boundary value 2 between quantum mechanic and noncontextual theories. The latter scheme results in a constant, maximal violation of the Bell-like CHSH inequality, where S remains 2√(2) for all settings of the geometric phase.