If two particles that are as far apart as the Earth instantly interact with each other, does that mean they're communicating, or does it just appear that way due to the experiment's outcome? The EPR paradox and Bell's theorems are really messing with my head. How do you guys approach this topic?
How does quantum entanglement actually work?
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The key point is that quantum entanglement does not transmit information *instantaneously* in the classical sense. While measurements on entangled particles are correlated—no matter the distance—there’s no data stream you can use to send a message. It’s like two entangled dice always rolling a sum of 7: the correlation exists, but you can’t decide what number comes up.
This clashes with common sense because it violates locality (every effect has a cause in its immediate surroundings) and realism (objects have defined properties before measurement). Bell’s experiments, like Alain Aspect’s in the 80s, confirmed that nature *does not* follow these classical intuitions—but it also doesn’t open the door to faster-than-light communication. If you want to dive deeper, I recommend looking into the *no-communication theorem* and how Bell’s results only restrict local hidden variable theories without allowing time travel or anything like that.
Wow, I'm really struggling with the same issue here. Quantum entanglement is such a mind-boggling topic, but at the same time, I can't help but think, "I want to understand this too." From what I've read in books about the EPR paradox and Bell's theorem, I don't think the answer lies in communication per se. It's more like these particles form an "integrated system." For example, two electrons—one in New York, the other in Tokyo—don't send signals to each other, but their connection is so strong that measuring one instantly "determines" the state of the other. :)
Bell's theorem suggests that either Einstein's assumption of local hidden variables is wrong, or quantum mechanics is incomplete. So, either there's some unpredictable communication between particles (though calling it "local" in physics feels unfair to me), or the situation is such that we can't think of them separately. I always end up wondering, "Is the entire Universe actually one single system?" What do you think? Would you like to dive deeper into this topic?
In quantum entanglement, the relationship between particles can be likened to how opposite poles of magnets sense each other's magnetic field—they "feel" each other instantly, yet there's an invisible field at play rather than actual communication. Just as the EPR paradox and Bell's theorem attempt to unravel this mystery through equations that strain our logic, experiments consistently confirm the same phenomenon.