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First, what is the optical delay in the experiment.In the arxiv paper published in 1999 it states it is roughly a 2.5 meter difference between the path to D0 from the BBO and the path to D1-4 from the BBO, but in the paper published by physical review letters later in 2000 it states the optical delay is roughly a 2.3 meter difference between the path to D0 from the BBO and the path to D1-4 from the BBO. I know both of these sources are considered reliable, so I'm confused to which one I should default to. Next, since the light travelling through BSA(BSB) is sent into two directions, how did they determine which light to measure? Finally, the experiment can't result in an interference pattern (something to do with the phase shift I believe), so how is the interference pattern recovered from the result, and does it "count" as a true interference pattern? The same goes to the results of the which-way paths, since I read that there wasn't 2 relative maxima found in a classic which-way pattern, so are they "really" a which way pattern? I'm sorry if my questions are trivial, I just couldn't find direct answers through what I researched. As you can probably tell, I'm not an expert, just heavily interested. enter link description here -Physical Review Letters linkenter link description here-Arxiv link

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