4 ms·

Yes, this is interesting because it seems like information would travel faster than light in this case, but based on our current knowledge about universe this w

Yes, this is interesting because it seems like information would travel faster than light in this case, but based on our current knowledge about universe this would break Einstein's Theory of Special Relativity, which could mean there is some other out of band channel of communication between entangled particles.

roywiggins 7y ago
Specifically, it violates the no-communication theorem. Not only can't you signal faster than light, you can't signal using measurement at all. https://en.m.wikipedia.org/wiki/No-communication_theorem?wprov=sfla1 https://en.m.wikipedia.org/wiki/No-communication_theorem?wpr...
- kgwgk 7y ago
  What is “it”? Where is the violation?
  - roywiggins 7y ago
    Just that classical information cannot be sent faster than light using measurements of entangled particles. Of course, quantum teleportation works, it's just not FTL, and the spooky connection between entangled particles can't be used to send information either.
    - kgwgk 7y ago
      So there is no violation anywhere. We agree :-) Your parent thought that there could be one (“it seems like information would travel faster than light in this case”) and your response (“specifically, it violates ...”) was somewhat confusing.
Diederich 7y ago
https://www.quora.com/Does-quantum-entanglement-violate-special-relativity https://www.quora.com/Does-quantum-entanglement-violate-spec... was illuminating.
smogcutter 7y ago
I've heard it analogized something like this: You and I have a deck of two playing cards. We know which cards they are. We shuffle them, and each take one without looking. Then we can travel as far from each other as we want, and whenever I take a peek at my card I'll know instantaneously what card you have (and vice versa). We remain connected at a distance, but no information really traveled faster than c and you and I couldn't use our knowledge of the other's card to communicate.
- perl4ever 7y ago
  Yeah, I've heard that analogy, and I've also read somewhere it's wrong, despite sounding good. But unfortunately I didn't absorb the explanation of why.

roywiggins 7y ago

Specifically, it violates the no-communication theorem. Not only can't you signal faster than light, you can't signal using measurement at all. https://en.m.wikipedia.org/wiki/No-communication_theorem?wprov=sfla1 https://en.m.wikipedia.org/wiki/No-communication_theorem?wpr...

kgwgk 7y ago
What is “it”? Where is the violation?
- roywiggins 7y ago
  Just that classical information cannot be sent faster than light using measurements of entangled particles. Of course, quantum teleportation works, it's just not FTL, and the spooky connection between entangled particles can't be used to send information either.
  - kgwgk 7y ago
    So there is no violation anywhere. We agree :-) Your parent thought that there could be one (“it seems like information would travel faster than light in this case”) and your response (“specifically, it violates ...”) was somewhat confusing.

Diederich 7y ago

https://www.quora.com/Does-quantum-entanglement-violate-special-relativity https://www.quora.com/Does-quantum-entanglement-violate-spec... was illuminating.

smogcutter 7y ago

I've heard it analogized something like this: You and I have a deck of two playing cards. We know which cards they are. We shuffle them, and each take one without looking. Then we can travel as far from each other as we want, and whenever I take a peek at my card I'll know instantaneously what card you have (and vice versa). We remain connected at a distance, but no information really traveled faster than c and you and I couldn't use our knowledge of the other's card to communicate.

perl4ever 7y ago
Yeah, I've heard that analogy, and I've also read somewhere it's wrong, despite sounding good. But unfortunately I didn't absorb the explanation of why.