Sunday, January 18, 2015

quantum mechanics - Kim delayed choice experiment


In Kim's delayed choice experiment as described in Wikipedia, you get interference patterns or not depending on whether you look at detectors D3 and D4 (which give you path information) or look at detectors D1 and D2 (which do not give you path information) and therefore gives you no interference patterns, or interference patterns, respectively.


My question is what does it mean to "look at" the results for either pair of detectors? Is not the coincidence detector operating in both cases? ..or for all beams? How do you control what you "look at"?





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