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Unformatted text preview: Georg.Hoffstaetter@Cornell.edu 89 x e & y e & y e & y e & y e & x e & x e & y e & polarizer x/y analyzer x/y analyzer combiner E & t E I 2 2 & 7) Quantum amplitudes and state vectors Interference of light Interference of waves: There are places which have intensity when either one of the slits is open, but nevertheless have no intensity when both slits are open. Intensity: To obtain the intensity one has to square the filed vector. The field is obtained by the vector sum of the fields for the different path that components of the wave can take. 03/14/2005 t E B E I 2 2 2 2 & & & = + Georg.Hoffstaetter@Cornell.edu 90 | x x | | x x | | y | y | x | y y | y | y | polarizer x/y analyzer x/y analyzer combiner Interference for a photon state The output intensity of a light wave corresponds to the number of photons and therefore to the probability that a photon is found in the output channel. To have photon probabilities correspond to wave intensities, one introduces a...
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