= Lev Vaidman
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{tag=Physicist}
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With <Avshalom Elitzur>, <Lev Vaidman> showed how an obstructed arm changes the possible outputs of a <Mach-Zehnder interferometer>. A click in an output forbidden by <destructive interference> when both arms are open can reveal the obstruction even though the detected <photon> was not absorbed there. The proposal makes the distinction between a successful conditional <quantum measurement> and an entire procedure particularly clear: other trials can absorb the <photon> or give an inconclusive result.<Quantum mechanical interaction-free measurements by Avshalom C. Elitzur and Lev Vaidman>[Sections 1–2, interferometer and outcome probabilities]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Lev%20vaidman.jpg?width=250]
{title=Portrait of <Lev Vaidman>}
{description=Yairm. https://creativecommons.org/licenses/by-sa/3.0/[CC BY-SA 3.0], via Wikimedia Commons.}
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