What does postselection mean?

Definitions for postselection
post·s·e·lec·tion

This dictionary definitions page includes all the possible meanings, example usage and translations of the word postselection.

Wiktionary

  1. postselectionadjective

    Following selection

Wikipedia

  1. Postselection

    In probability theory, to postselect is to condition a probability space upon the occurrence of a given event. In symbols, once we postselect for an event E {\displaystyle E} , the probability of some other event F {\displaystyle F} changes from Pr ⁡ [ F ] {\textstyle \operatorname {Pr} [F]} to the conditional probability Pr ⁡ [ F | E ] {\displaystyle \operatorname {Pr} [F\,|\,E]} . For a discrete probability space, Pr ⁡ [ F | E ] = Pr ⁡ [ F ∩ E ] Pr ⁡ [ E ] {\textstyle \operatorname {Pr} [F\,|\,E]={\frac {\operatorname {Pr} [F\,\cap \,E]}{\operatorname {Pr} [E]}}} , and thus we require that Pr ⁡ [ E ] {\textstyle \operatorname {Pr} [E]} 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 PostBQP is equal to PP. Some quantum experiments use post-selection after the experiment as a replacement for communication during the experiment, by post-selecting the communicated value into a constant.

Wikidata

  1. Postselection

    In probability theory, to postselect is to condition a probability space upon the occurrence of a given event. In symbols, once we postselect for an event E, the probability of some other event F changes from Pr[F] to the conditional probability Pr[F|E]. For a discrete probability space, Pr[F|E] = Pr[F and E]/Pr[E], and thus we require that Pr[E] be strictly positive in order for the postselection to be well-defined. See also PostBQP, a complexity class defined with postselection.

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Numerology

  1. Chaldean Numerology

    The numerical value of postselection in Chaldean Numerology is: 4

  2. Pythagorean Numerology

    The numerical value of postselection in Pythagorean Numerology is: 1

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"postselection." Definitions.net. STANDS4 LLC, 2024. Web. 29 Mar. 2024. <https://www.definitions.net/definition/postselection>.

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