Consider a sequence of Stern–Gerlach tests where an unpolarized beam
passes through an SG
z
and subsequently through an SG
x
. Clearly there are
four possible outcomes: a screen placed at the end will show up 4 spots as in
Figure 2.8.
If we place another SG
z
at the end, we expect eight possible outcomes as
in Figure 2.9.
If we now slowly turn off the middle SG
x
, we expect the x−separation of
the beams to slowly reduce until they coalesce and we expect four outcome
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