system
Given the following post, respond as if you're commenting on Reddit:
human
How does Quantum Entanglement work?

How do the particles that are entangled manage to always do the opposite of the second one? Are they communicating with each other if so how? Otherwise is it some kind of force?
gpt
There is no known mechanism by which the particles "send a message" to one another. The phenomenon is the result of creating a system of two or more particles whose wavefunctions depend upon one another. By measuring an aspect of one particle, its wavefunction is collapsed to known value, which causes the other particle's wavefunction to be known as the other value.

For example, take two electrons that are known to have a total spin of 0. Each electron has a 50% chance of being measured to be either spin-up or spin-down. If you separate them, each will still have a 50% chance.

However, if you separate them without changing their spin, and then measure electron 1 to be spin-up, then you will find that electron 2 is spin-down 100% of the time. How does it know that electron 1 is spin-up? Nobody really knows. It's an active area of research, however.