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0 votes
4 answers
331 views

Is signal photon independent of idler photon in Delayed Choice Quantum Eraser?

--Diagram from Wikipedia of the experiment of Kim et al. (1999) Original research paper: A Delayed Choice Quantum Eraser I want to know whether the landing position of the signal photon (photon that ...
Duke William's user avatar
3 votes
1 answer
222 views

Can we tell if a particle has collapsed due to a measurement?

Suppose we have two electrons A and B. My friend measure the spin on electron B the value is +1/2, and he writes on a piece of a paper the value. Electron A has not been measured, so the spin is in ...
Stefano Balzarotti's user avatar
6 votes
4 answers
2k views

Doesn't the Schrödinger's cat inside the box cause the probability wave function to collapse long before a human opens the box?

My point is that there is no superposition of dead and alive. The cat will cause the probability function to collapse long before we open the box. What am I missing here? Isn't the cat capable of ...
Eddie Bravo's user avatar