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Total layman, I’m sure I’ll get corrected if I’m wrong here: Bell's Theorem is just a model showing how two sets of measurements of certain properties of entan
by crystalmeph 5y ago
Total layman, I’m sure I’ll get corrected if I’m wrong here:
Bell's Theorem is just a model showing how two sets of measurements of certain properties of entangled particles would differ in a “Quantum Physics” regime where there is spooky action at a distance changing the measured properties versus a “common sense” regime where both particles leave the entanglement site with those properties already set.
[0] is a fairly easy to understand graph of the correlation of the measurements at the two sites in both regimes, even if the math that generates those charts is beyond me.
Given that, just knowing what measurements you got only gives you an idea of what the other guy across the universe would see were he to measure your particle’s entangled partner - he has no more control over what those measurements actually are than you do, you just know that there’s a certain correlation between what you saw and what he saw. That’s why you can’t use Bell’s Theorem to communicate, neither one of you is actually controlling the measured property, there’s just a certain correlation between the measurements both of you got.
It seems to this layman that in order to communicate FTL using QM, you’d need a way to determine that the property being measured has already been “collapsed” (if that’s the right word) by spooky action at a distance, e.g if the other guy had already measured it. Bell’s Theorem gives us no way to determine if the other guy has actually made the measurements, it assumes that both you and he have both made those measurements.
[0]: https://en.wikipedia.org/wiki/Bell's_theorem#/media/File:Bell.svg https://en.wikipedia.org/wiki/Bell's_theorem#/media/File:Bel...
- seph-reed 5y agoWhy can't you control the outcome on your end? Or can we just not do it yet?
- crystalmeph 5y agoYou’re measuring the value, not setting it. Just like looking at a ball that was wrapped in a bag, seeing that it is red means your partner must therefore have picked the blue ball, but there’s no way you can control whether your partner had the red or blue ball, so the two of you can’t use that information to communicate FTL.