Half a coin: negative probabilities http://www.wilmott.com/pdfs/100609_gjs.pdf …
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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.
.@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 …
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@michael_nielsen Yes, I know that paper. Sum of two half coins has "miraculous" cancelling of sums other than 0 or 1. This is extra weird.Thanks. Twitter will use this to make your timeline better. UndoUndo
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@michael_nielsen Eg. pair of quantum SHOs in appropriate state gives total energy 0 or 1 despite each state possibly having any energy.Thanks. Twitter will use this to make your timeline better. UndoUndo
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@michael_nielsen@sigfpe N.B. those 4 quasiprobabilities correspond to a tetrahedron inscribed in Bloch sphere, i.e., qubit SIC-POVMThanks. Twitter will use this to make your timeline better. UndoUndo
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