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  • SevenTales
    +3

    Oh! That's an easier and at the same time harder question to answer. There's a lot of ways to make them "pair", which just mean that their states are identical. Entanglement just mean exactly what I described. The two particles, instead of having separate "quantum states", really only have one, which makes them behave like they do. As to how, the most used way is, and prepare for the fancy title, Spontaneous parametric down-conversion. It's more than a little complicated, but can be boiled down to this: We shoot a high powered laser at a special crystal (made out of barium borate). Most of the time, the photons go through normally, but then something happens: Sometimes, a photon is split, and instead of going straight, goes in 2 opposite directions (in the shape of a cone), and you get two entangled photons.

    • ColonBowel
      +3

      So it's the same photon in 2 different places? If so, did we just create something?

      • SevenTales
        +2

        We didn't create anything, as the 2 photons's energies are equal to the original photon. So it's not the same photon, and we did not create anything either.