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I am new here and also in physics.

I tried to understand the experiment more. In the following youtube video. the demonstration indicated that an entangled photon arrived at $D_0$ while its partner arrived at, let's say $D_2$ or $D_3$ later on. I don't know why an already entangled single photon can leave interference data on $D_0$. Isn't A PAIR of it can be form interference wave? I think I am missing some very basic physics knowledge.

delayed choice experiment start by 6:54

Norbert Schuch
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monique Yeung
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1 Answers1

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The same way a single photon in the original double slit experiment does, https://en.wikipedia.org/wiki/Double-slit_experiment

The wave interferes with itself. A photon is just the interactable component of the wave.

Yogi DMT
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