The diagrams helped clear it up for me (I think.) Yes, they are entangling them on Earth and this seems to be testing the idea that an atom created here is the same/similar enough to one from the sun for this to take place. "Figure 4: Entanglement fidelity measurement of the entangled photon pairs with no common history." It's something I would have assumed as a novice but it's interesting that they thought to test it. If you couldn't entangle them, what would that mean?
It looks like the keyword in the title was light "sources" that are 150 Million Kilometers apart. I didn't catch that at first.
It looks like the keyword in the title was light "sources" that are 150 Million Kilometers apart. I didn't catch that at first.