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Cramer and his colleagues propose using a special lithium iodate crystal to create two streams of photons. First they would conduct what Cramer called "a rather simple tabletop experiment" to demonstrate quantum entanglement with a two-slit screen and two detectors, much as other researchers have done already.
If they're successful with the first experiment, they would try a more elaborate demonstration: One stream would be sent directly through the screen to a detector — while the other would be split by the slits, then take a detour through two 6-mile (10-kilometer) lengths of optical cable before reaching a second detector.
The researchers would adjust the position of the second detector to find the spot where the stream changes from a fuzzy diffraction pattern to a more defined, wavy interference pattern. Theoretically, because the streams contain entangled photons, the first detector should register the same changes 50 microseconds earlier.