1967 pdf link on Susskind and Aharonov
So they are stating that in classical physics the 720 degree spin is unobservable since it's noncommutative at 360. But they state in quantum physics it IS observable. No mention of Bernstein though. this 2006 pdf shows the Bernstein connection to Aharonov and Susskind
Here's another one:
INTERFEROMETRY WITH PARTICLES OF NON-ZERO REST MASS ...
So here it is:
Spin Precession During Interferometry of Fermions and the Phase Factor Associated with Rotations Through Radians
unpolarized neutrons is analyzed. The analysis elucidates the connection with a possible
observation of the phase factor (-1) associated with the rotation of a half-integral spin particle …
OK so this is a fascinating paper.
So now we go back to the video demonstration of the Dirac Dance of electrons (and people)
So the key point here is that instead of assuming a static zero field - there is a magnetic quantum potential field that creates a double refracting medium aka a torque.
So in the "classical case" there has to be "invariance" for the 2pi (360 degree) rotation.
Since the Neutron has no charge then spin can be isolated for testing.
And then
OK so what did Eddie Oshins say about this Aharonov-Susskind-Bernstein Effect?
Notice this is precisely what Lawrence Domash also proposed - and he was a quantum physicist at Hampshire College where Bernstein teaches.
back to Susskind and Aharonov:
So again Eddie Oshins wanted to test this out -
Math Prof. Louis Kauffman gives credit to Eddie Oshins, martial artist, for collaboration in developing this Quaternion Handshake - youtube
So under classical math and physics - there is no way to "isolate" and measure the 1/2 spin "field." But by using neutrons with a background magnetic field - then a non-local phase shift can be detected that is pure spin, via the entanglement of the neutrons (since neutrons have no charge).
https://phys.org/news/2015-08-neural-qubits-quantum-cognition-based.html
Fisher claims that the element with the optimal coherence time (Tcoh), and therefore the one ideally poised to host the putative neural qubit should have nuclear spin of 1/2. In a biochemical setting, spin 1/2 nuclei are weakly decohered only by magnetic fields while for spin >1/2 electric fields cause large decoherence. Spin 0 nuclei lack any associated magnetic dipole moment interaction with nuclear magnetic fields
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