Pathangled states allow Berry phases and production angles to serve as degrees of freedom for Bell correlations, with an approximate critical angle of 24.97 degrees marking the boundary between local-hidden-variable theories and quantum mechanics.
Hasegawa, Entanglement between degrees of freedom in a single-particle system revealed in neutron interfer- ometry, Found Phys 42, 29 (2012)
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Berry Phase in Pathangled Systems
Pathangled states allow Berry phases and production angles to serve as degrees of freedom for Bell correlations, with an approximate critical angle of 24.97 degrees marking the boundary between local-hidden-variable theories and quantum mechanics.