Double slit experiment, 8.2
In the double slit experiment, the screen is used to detect interference pattern itself, causing the photon wavefunctions to “collapse”.
In the Afshar experiment, there is no classically definite position for a photon when the photon passes “through” the vertically wire slits. So there is no interference patterns “formed”, unless you put some kind of screen afterwards. [Me@2015-07-21 10:59 PM: i.e. making the observation, c.f. delayed choice experiment]
— Me@2012-04-09 12:19:52 AM
Being massless, they cannot be localized without being destroyed…
— Photon dynamics in the double-slit experiment
— Wikipedia on Photon
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