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In Bell's theorem and CHSH, [itex]A(a, \lambda)[/itex] is defined as the outcome for detector [itex]A[/itex] with setting [itex]a[/itex] and hidden variable [itex]\lambda[/itex]. The outcome of this can be either -1, 0 or 1, so three outcomes.

It is clear what outcomes -1 and 1 refer to. But what about 0? Two relevant examples:

- In spin measurement, using a stern-gerlach device, -1 and 1 would be opposing spin directions (what about 0? The particle not being measured at all?)

- In polarization measurement, -1 would be "blocked" by the filter, and 1 would be "passed" through the filter (and I've got no idea at all what 0 could possible mean?)

So what is this "0" outcome?

Thanks in advance

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# Three outcome systems in Bell/CHSH

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