= David Albert
{c}
{tag=Physicist}
{wiki}
= David Z. Albert
{c}
{synonym}
<David Albert>, <Yakir Aharonov> and <Lev Vaidman> introduced the <weak value> associated with preparing $|i\rangle$ and selecting a later outcome $|f\rangle$: $A_w=\langle f|A|i\rangle/\langle f|i\rangle$ when the denominator is nonzero. A sufficiently weak coupling followed by this selection can produce a conditional average pointer shift outside the <eigenvalue> range of the measured <observable>. This concerns the statistics of selected weak measurements; it does not assert that a single projective <quantum measurement> returns an otherwise forbidden <eigenvalue>.<Weak values by Yakir Aharonov, David Z. Albert and Lev Vaidman>[1988 paper, preselection, postselection and anomalous weak measurement result]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/David%20Albert.jpg?width=250]
{title=Portrait of <David Albert>}
{description=Markus Pössel (Mapos). https://creativecommons.org/licenses/by-sa/3.0/[CC BY-SA 3.0], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:David_Albert.jpg}
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