Does measurement necessarily change the state?

[DrChinese]

When you measure a million electrons in the vertical axis, you get 1/2 million U and 1/2 million D. What happens when you measure the polarization of a million photons in a given axis?

1/2 million H and 1/2 million V, assuming they are polarization entangled.

 

[Larry Pendarvis]

1/2 million H and 1/2 million V, assuming they are polarization entangled.

okay then they are not

 

[Nugatory]

PeterDonis's advice in your other thread (https://www.physicsforums.com/threa...e-and-mixed-states.794432/page-2#post-4989278) applies here as well. This thread is closed.