Far from my expertise, but sheer curiosity. I've read that PostBQP ("a complexity class consisting of all of the computational problems solvable in polynomial time on a quantum Turing machine with postselection and bounded error") is very powerful. Still, I don't understand the practical sense of assuming you can decide the value an output qubit takes.

My question: Have post-selection quantum computing experiments been implemented (or is it possible that they will be implemented)? (And, if the answer is yes: how does post-selection take place in a way that practically enhances your computing power?)

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    $\begingroup$ I think the answers in the question I linked would answer this question as well. If not, please explain why those answers don't, so that we can clarify this question. $\endgroup$ May 27 '18 at 8:52
  • $\begingroup$ The question is different... but it turns out that the answers do satisfy my question. Thanks! $\endgroup$ May 27 '18 at 9:00