Why would'nt this work?
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The only time any information can be encoded onto entangled particles is when they’re created.
If that were the case, then we aren't really doing FTL communication, unless we manage to entangle them at a distance. No?
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- Aceticon BcS Applied Bullshit
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This is a nice example that also makes me think more questions.
- Will the hole punching be forward or backward?
- Assuming infinite deceleration, for an observer on the other end of the barn, will the barn be punched through, before or after the pole-pusher has stopped?
- For the pole-pusher, will the barn be punched through, before or after it has stopped?
Gets more interesting
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You said unfoldable not non-compressible. Your fault.
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You know what's more crazy. Electrons don't flow at the speed of light through a wire. Current is like Newtons Cradle, you push one electron in on one side and another bounces out on the other side, that happens at almost light speed. But individual electrons only travel at roughly 1cm per second trough a wire.
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it wouldn't work, because there is no unbreakable, unfoldable stick. the stick will have flex, and the force transmitted will occur much more slowly through the molecular chain of the stick than light's travel time.
reality is much more woobly and spongy than you know.
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The stick would only move at the speed of sound. Or the speed the molecules can push against each other, which is the speed of sound in that material.
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The issue is, that kind of stick wouldn't even exist. You'd have better luck with between some dwarf planet and its satellite, since the stick would break under its mere weight.
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...so the thing is that, after accounting for time dilation, light is instantaneous and perhaps better-described as the speed of causality...even a perfect stick comprising quantum-crystal wonder-material can't move before it's pushed, so you'd find that it, too, transmits information at the speed of light...
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It's a thought experiment. Of course such a stick wouldn't exist. OP's question is what laws of physics prevent this theoretical scenario from working.
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You also cannot choose the spins of entangled particles, they collapse randomly in either direction when interacted with, meaning you cannot send messages. If you can figure out how to directly influence the spin of generated subatomic particles then BAM you have FTL communication.
But you would be amazed how many obstacles the universe throws in front of you when you try to break the speed of causality. Faster than light communication isn't possible because it makes no sense when you understand it. It's like "getting answers faster than questions." It's nonsense.
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but since the pole still won’t fit it either punches holes in the barn or shatters.
Latest research is suggesting that the observer from the pole's perspective sees the far door open before the near door, basically reversing the order of events. (Assuming the barn doors close briefly around to contain the pole, and then open again to let it through. The Barn sees the entire pole momentarily inside the barn with both doors closed, the pole sees itself enter the short barn, the far door closes briefly and then opens letting the front of the pole through, then the back door closes and opens as it passes through. IE: order of events can be recorded differently for each observer without breaking causality.)
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I enjoyed a lot of the discussion in the comments
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In carrot vs stick terms, this is the most unfortunate fellow: he who can't avoid the stick.
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Stop fooling around and give Ruyi Jingu Bang back to Sun Wukong.
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Yep. Like holding a jump rope between two people, and one of them sends a wave through it to the other. The force still has to travel through the material.
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That would not work. Pushing an object is transmitting kinetic energy to it. The object will push back, and energy would not be distributed to the whole object at the same time.
If the object cannot be altered in any way, then the energy would not be transferred to it, and if it has enough plasticity to absorb the kinetic energy, it would be spread in a wave to the tip. A wave that would always be slower than light.Now stop fooling around and give Ruyi Jingu Bang back to Sun Wukong.
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Okay for a thought experiment what if it’s a perfect element incapable of that?
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You are slightly and temporarily increasing the spacing between atoms/compounds in the stick. This spacing will effectively travel like a shockwave of "pull" down the stick.
