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Farklurth t1_j9p1n1n wrote

Reply to comment by subjectwonder8 in Physicists Use Quantum Mechanics to Pull Energy out of Nothing by Vailhem

That's absolutely amazing. So in theory when we have FTL spacecrafts we can communicate over vast distances without any problems.

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videopro10 t1_j9pblra wrote

Actually no, you would have to know the state of the particle at your departure point, which you can't know without that info being transmitted at the speed of light.

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zabuu t1_j9piwn2 wrote

Not quite... once you observe (read: measure) an entangled particle, it is no longer entangled.

Imagine 2 people face to face on a perfectly slippery frozen lake. If they push apart from each other, they would slide away. If you know the mass of each person, and you catch person A (this is like measuring the speed), then you'll know how fast person B is going. But measuring A changed the system and you'll get no additional info about B.

I'm no pro though, this is just how I understand it.

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