Since my previous post got eaten...
If an entangled photon is measured as a particle, does it force the entangled partner to also behave as a particle?
If so, wouldn't that prevent the partner photon from creating an interference pattern, *whether or not it is observed passing through a slit*?
Or would that cause them to become untangled, since otherwise it would tell the people observing the pattern that the entangled photon has been observed?
EDIT: Yes, that *would* be FTL communication.
Could you please frame your post in a way that is relevant to space technology? Otherwise it may not really belong on this forum.
It's about constructing an ansible for instantaneous communication. How is that not relevant?
It's about constructing an ansible for instantaneous communication. How is that not relevant?
The lack of any words in your first post or the thread title that have anything to do with the word ansible.
Anyway everything in your first post indicates that you have not actually studied quantum mechanics, because you are using terminology in ways that simply don't make an sense. Fully explaining everything wrong with your post would require writing a book, but people have already written textbooks on quantum mechanics.
The short version is that "wave or particle" is not a property that entanglement applies to, all particles always behave as both. Also, the double slit experiment involves using the wavelike nature of particles, if you set it up to avois this, by forcing the particles to only go through one of the slits, it is not a double slit experiment.
As far as ansibles go, there is a theorem in quantum mechanics called the "no communication theorem" that is a rigorous proof that nothing in the entire theory of quantum mechanics can ever be used as the basis for an ansible. If you think you came up with a way to make an ansible, this theorem guarantees that you made a mistake.