Has Wave Function Collapse Been Verified Experimentally ?

morrobay
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In QM theory entangled particles or photons are in superposition for spin (spin up or spin down) or for polarization angles.
When one of the space like separated pair is measured for a spin or polarization observable,
the wave function collapses and the other particle is then in a definite spin or polarization state
in accord with conservation laws. Although Bell Inequality violations show there cannot be
pre determined values. Have experiments actually verified superposition / wave function collapse with
space like separated particles ?
 
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