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  2. What is the CHSH inequality?

“A version of Bell's inequality from 1969 (by Clauser, Horne, Shimony and Holt) that's practical to test in a lab. Local theories can't exceed 2, but quantum mechanics can reach about 2.83 (2√2).”

Reference: Clauser, Horne, Shimony & Holt, *Physical Review Letters* (1969)

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