In probability theory, to postselect is to condition a probability space upon the occurrence of a given event.
For a discrete probability space,
be strictly positive in order for the postselection to be well-defined.
See also PostBQP, a complexity class defined with postselection.
Using postselection it seems quantum Turing machines are much more powerful: Scott Aaronson proved[1][2] PostBQP is equal to PP.
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