Say you have two entangled photons emitted by some kind of laser incident on a crystal lattice.
Before you measure--that is, polarize--one of them, you have no idea about their state.
This could just as easily be a case for withdrawal as it is for a
Protagorean view that the measuring apparatus or process or measuring
human is more real than what is measured (the Standard Model assumes this when it prohibits ontological interpretations of quantum scale phenomena).
Since "measure" at this level means "deflect or otherwise alter"
then we cannot possibly be dealing with idealism... To measure is to
affect, with a tool, as it were. Just as when I "measure" a table using a
tape measure I'm just putting some tape next to a table and reading it.
I'm not creating the table. It seems to me that the
correlationist/idealist interpretation of QT is a defense against the
most obvious interpretation--that there truly are things that are not
your mind and not influenced by your mind.
Here's another way of looking at it. The second photon polarizes in a
complementary way, when you polarize the first. It does so instantly.
Your mind couldn't possibly have an instantaneous effect, if like a
materialist you think that your mind reduces to your brain, which is
electrochemical. Way way slower than light, and certainly slower than
instant. It would be hard for your average physicist to claim that
without feeling silly.
Unless the physicist wants to admit that the two photons are really
just two sides of one thing--back to Bohm. This is precisely why Bohm
put forward his monist implicate order...