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Jun 3, 2020 at 15:48 comment added ACuriousMind It may be worth to mention that the physical realization of the "quantum coin" are typically spinful objects (e.g. silver atoms) in a Stern-Gerlach experiment, and "colour" or "face" are different directions of spin.
Jun 3, 2020 at 11:32 history edited innisfree CC BY-SA 4.0
added 47 characters in body
Jun 3, 2020 at 11:25 history answered innisfree CC BY-SA 4.0