Half a coin: negative probabilities http://www.wilmott.com/pdfs/100609_gjs.pdf …
.@sigfpe My undergrad thesis was on negative probabilities and how they can be used to simplify parts of quantum mechanics. Fun stuff.
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@michael_nielsen It should be straightforward to come up with a quantum analogue of the half-coin. Then measure sum of two such systems. -
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@sigfpe A qubit can be viewed as a 4-state classical system, with negative probabilities for some states. Eg: http://cds.cern.ch/record/154856/files/pre-27827.pdf … - 1 more reply
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