  The entangled state that results when a detector measures a superposed
quantum system has spawned decades of concern about the problem of definite
outcomes or "Schrodinger's cat." This state seems to describe a detector in an
indefinite or "smeared" situation of indicating two macroscopic configurations
simultaneously. This would be paradoxical. Since all entangled states are known
to have nonlocal properties, and since measurements have obvious nonlocal
characteristics, it's natural to turn to nonlocality experiments for insight
into this question. Unlike the measurement situation where the phase is fixed
at zero for perfect correlations, nonlocality experiments cover the full range
of superposition phases and can thus show precisely what entangled states
superpose. For two-state systems, these experiments reveal that the measurement
state is not a superposition of two macroscopically different detector states
but instead a superposition of two coherent correlations between distinct
detector states and corresponding system states. In the measurement situation
(i.e. at zero phase), and assuming the Schrodinger's cat scenario, the
entangled state can be read as follows: An undecayed nucleus is perfectly
correlated with an alive cat, AND a decayed nucleus is perfectly correlated
with a dead cat, where "AND" indicates the superposition. This is not
paradoxical.
