[indutny]

In this image: https://advances.sciencemag.org/content/advances/5/7/eaaw256... they describe their apparatus.

The light comes from bottom left, then gets into Beam Splitter (BS) and splits in two. The top-left detector has a pre-selected filter and a measurement device after a delay line. As far as I understand, this device gives binary output: either light received or not. The top-right detector captures whole image of the light ray, but does so only if the left detector has seen light.

The result is that the image from the top-right detector is highly correlated with the pre-selected filter of the top-left detector, even though they're placed in different arms of Beam Splitter! https://advances.sciencemag.org/content/advances/5/7/eaaw256...

[Kovah]

Thank you for the setup explanation. I understood what is happening and it is totally fascinating, even if I do not - and probably never can - understand why or how this is happening.