I have a question regarding the quantum eraser experiment, explained by Tom Campbell in https://www.youtube.com/watch?v=xo176uIPmbY
What happens if we look at the “screen image” envelopes first?
My estimation is that if we look at the “screen image” envelopes first before destroying the “which way” envelopes, we see 2 strips (classical particle behavior), even if the “which way” envelopes are never looked at (or destroyed).
Otherwise, according to my understanding, this leads to the following paradox:
If the “screen image” envelope shows diffraction image (wave behavior), we then open the “which way” envelope, and have a contradiction.
On the other hand, if the “screen image” envelope shows 2 strips (classical particle behavior), we then destroy the “which way” envelope, and have a contradiction again.
In addition, according to my understanding, even if we perform the experiment exactly as explained in the video, we could predict future events as follows:
For example, suppose we want to know how many years someone (a 20 years old guy) will live (in 10 years resolution). We can do the following:
We do the quantum eraser experiment like Tom suggests 10 times, and give that person the 10 “which way” envelopes, marked 1 to 10.
Each decade, this person will destroy one envelope at a time.
After his death, his siblings will publish the remaining envelopes.
Now, immediately after the experiment we look at the “screen image” envelopes, and see how many of them shows a diffraction pattern, which tells us how many years he will live…
Your answers/comments are greatly appreciated!