File:Mach-Zender interferometer paradox.svg
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[edit]DescriptionMach-Zender interferometer paradox.svg |
English: Counterfactual measurement in quantum mechanics. A Mach-Zehnder interferometer is adjusted so that 100% of the output impinges upon detector B. Having been adjusted in such a manner, 100% of the light will continue to reach B even if the the light intensity is reduced so that only one photon at a time travels through the apparatus. It appears as if the wave function of each individual photon travels both paths and engages in interference at the last beam splitter, so that only the wave to B is constructive. In figure (a), although the photon is illustrated as having taken the "northern" branch of the interferometer, it interferes with itself so that only detector B detects the photon. The same holds for figure (b), although the photon is considered to have taken the "southern" branch of the interferometer. Figure (c) illustrates the situation where an obstacle has been introduced on the "southern" branch of the interferometer. 50% of the photons are deflected by mirror M, and the remaining photons are split 25% to detector A, and 25% to detector B. |
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Source | Derivative work of File:Interferometre de Mach-Zender paradoxe.svg with thicker lines, larger font, and labels |
Author | Tatoute (original author), Quibik (modifications), and myself (modifications) |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 04:20, 26 March 2013 | ![]() | 880 × 636 (164 KB) | Stigmatella aurantiaca (talk | contribs) | Made lines more consistent and added labels |
02:35, 16 March 2013 | ![]() | 880 × 636 (140 KB) | Stigmatella aurantiaca (talk | contribs) | Removed spurious character | |
02:03, 16 March 2013 | ![]() | 880 × 636 (140 KB) | Stigmatella aurantiaca (talk | contribs) | Added some labels accidentally omitted in previous upload | |
01:25, 16 March 2013 | ![]() | 880 × 636 (127 KB) | Stigmatella aurantiaca (talk | contribs) | User created page with UploadWizard |
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Width | 880px |
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Height | 636px |