How do nonclassical observations influence eventual classical outcomes?

[Loren Booda]

Can the choices of quantum measurement ever affect subsequent macroscopic possibilities, or do their statistics always average out overall, a la the correspondence principle?

[selfAdjoint]

It is possible to arrange experiments so that the averaging does not wash out the effects. After all, all the "quantum weirdness" experiments show macroscopic effects (bands on a screen or whatever) from quantum causes.

[HallsofIvy]

That was the whole point of "Schroedinger's cat" wasn't it- that quantum measurements can affect macro systems?

[Loren Booda]

Thanks, folks, I just needed to be reminded.