Oh cool! This experiment is very fun, not just from the results side. I was able to get a tour with the photonic side of this set-up (not the atomic side, as th

Oh cool! This experiment is very fun, not just from the results side. I was able to get a tour with the photonic side of this set-up (not the atomic side, as this paper elucidates). The photons are made entangled, then split and sent into some fiber-optic cables that run about in the tracts in the hallways. The rooms used to measure the entanglements are sufficiently far apart, but due to budgets, are at right angles from the source. We only went to one of the rooms, but the measurement devices are housed in marijuana grow pods you can buy, as they tend to keep the temperature stable, have access for the wires and cryogenic tubes, will keep out/in EM noise, and are pretty cheap. There was a line on the floor of that room, off in the corner, that had where the 'light speed' signal from the other measurement room stopped when the measurement (in the room we were in) was made, proving that the measurements could not interact. If you ever get a chance, get a tour at NIST, it is well worth whatever strings you have to pull. Getting to see The United States Second (where the US measures all of out time from) was a real highlight of my scientific career.