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Jun 26, 2015 at 12:13 vote accept Thomas Elliot
Jun 26, 2015 at 12:13
Jun 24, 2015 at 21:04 comment added Count Iblis @ThomasElliot You can always represent a mixed state as a pure state by considering a larger system, see here.
Jun 24, 2015 at 20:39 comment added Thomas Elliot You can only with the density matrix formalism take your own ignoranz into account. If you use the Braket you kind of assume that you know everything about the state. So, my question is how one can be bold enough to make such a claim.
Jun 24, 2015 at 18:48 history answered David Z CC BY-SA 3.0