# Quantum Entanglement - faster than light communication [duplicate]

very new here - first question in fact.

So, don't be fooled by the title of my question. I understand that the Bell Paradox - and non-locality - prevents information being exchanged in a faster than light matter.

So, Spaceman A on Neptune, cannot send a morse-coded message to Earth using quantum entangled particles - the need to force a particle to choose a state releases the entangled particle at the other end from behaving (instantaneously) in a determined matter. Information from Spaceman A cannot be sent from Neptune to Earth at faster than light.

But - my question is - who cares about spaceman - or any conscious entity sending information - -the fact is the entangled particles themselves are affected at faster than light speed. Particle A observed on Neptune at midday will have the same state of spin as Particle B observed at an equal time on Earth. The observation and confirmation of the fact takes place retrospectively - but this doesn't detract from the fact that the wavefunction will be demonstrated to have collapsed simultaneously across a vast distance - something is acting on them at faster than light speed.

Any thoughts, or comments to explain why this is wrong, greatfully recieved !!

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• Comments are not for extended discussion; this conversation has been moved to chat. – ACuriousMind Dec 22 '17 at 23:36

• @safesphere: At time $0$, the wave function is $U\otimes U+D\otimes D$. At time $1$, following an observation on the first particle, the wave function is at $U\otimes U$. How many meters did the wave function travel? – WillO Dec 22 '17 at 5:52
• @safesphere: No, actually I'm saying what I said, not what you said I seem to be saying. The wave function does not (and can not) "travel with the particle" because they travel in different spaces. By analogy: Can a particle's momentum change faster than the speed of light? Answer: The question makes no sense, because a change in momentum and a speed are measured in different units. A particle moves through a space $S$; its momentum moves through a different space $T_*S$. And its quantum state moves through yet another different space $H$. – WillO Dec 22 '17 at 13:45