class18 - Announcements Reading for Wednesday: 5.6 5.7...

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Announcements • Reading for Wednesday: 5.6 – 5.7 Which slit did this photon go through? a. left b. right c. both d. neither e. either left or right we just cannot know which one Which slit did this photon go through? If one slit: Get single slit pattern (i.e. no interference) Like this: or this: But: that photon is part of the two slit interference pattern. The probability pattern of where it lands is described by the 2 slit interference pattern (the photon has to ‘know’ about both slits!) It must have gone through both slits, i. e. as a wave! (When it interacts with the screen it behaves particle-like!) quantum-wave-interference_en.jar but not like this: Photon before it goes through the slits Photon as little segment of wave moving towards slits Intensity of wave in various places, indicates probability of finding the photon there if you looked at that moment. Photon after it went through the slits Still only one photon! (But this photon has a slightly complicated wave function.) Photon is a wave… It can interfere with itself. Intensity of wave in various
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This note was uploaded on 08/24/2010 for the course PHYS 2130 taught by Professor Staff during the Spring '08 term at Colorado.

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class18 - Announcements Reading for Wednesday: 5.6 5.7...

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