Quote:
"Are the physical observations dependent on the number of Observers involved?"
Blood Music, Greg Bear, 1985.

Any observation empirically instantaneously collapses the virutal wavefunction superposition into a consistent observable without regard to spatial separation of its entangled components. Multiple serial observations would give the expected statistical distribution of possible outcomes. Parallel observations must be consistent - the universe does not tolerate paradox.

That leaves nothing consistent with more than a half-century of professional observation for you to discover.

Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz3.pdf