= Hugh Everett III
{c}
{tag=Physicist}
{title2=1930–1982}
{wiki}
<Hugh Everett III> proposed treating an observer and a measured <quantum system> within one <unitary> <quantum dynamics>. For an ideal <quantum measurement>, $\alpha|0\rangle|R\rangle+\beta|1\rangle|R\rangle$ evolves into $\alpha|0\rangle|A_0\rangle+\beta|1\rangle|A_1\rangle$: the apparatus records become correlated with the alternatives. A <relative state> describes the measured <quantum system> conditional on a particular record, while the joint <quantum state> remains <entangled>. His 1957 formulation sought to account for records within this common dynamics, without adding a separate dynamical <wave function collapse> postulate.<Relative State Formulation of Quantum Mechanics by Hugh Everett III>[Discussion of measurement correlations and relative states]{ref}
A <physicist> who proposed a <unitary> relative-state account of <quantum measurement>, developed in the <many-worlds interpretation>.
\Image[https://upload.wikimedia.org/wikipedia/en/c/cf/Hugh-Everett.jpg]
{title=Hugh Everett III in 1964; Hugh Everett III papers, University of California, Irvine; photographer unrecorded in the Wikimedia file record; non-free historical portrait hosted by English Wikipedia}
{source=https://en.wikipedia.org/wiki/File:Hugh-Everett.jpg}
{width=250}
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