"Physicists have devised a way to take pictures using light that has not interacted with the object being photographed."
Then in another paragraph it says:
"In the first path, one photon in the pair passes through the object to be imaged"
So the light actually has interacted with the object to be photographed. The opening paragraph is obviously wrong.
Furthermore, another paragraph says:
"In ghost imaging, even though only one photon interacts with the object, both photons need to be collected to reconstruct the image, whereas in the Vienna team's work only one photon needs to be detected"
Then another one says:
"The remaining photon from the second path is also reunited with itself from the first path and directed towards a camera"
So again, the article contains a huge ambiguity, because in one paragraph it says that only one photon is needed for the photograph and then it says that one photon needs to be reunited with another photon (even if they are entangled, they are still different photons), so two photos are needed for the photograph.
Are they entangled, or just potential photons? When splitting light, photons go 'both ways' potentially even though is a classical sense there is only 1 photon that will ever be detected. Recombining them is still meaningful in a wave sense, because each potential photon path interacts with the other when the paths are reunited.
"Physicists have devised a way to take pictures using light that has not interacted with the object being photographed."
Then in another paragraph it says:
"In the first path, one photon in the pair passes through the object to be imaged"
So the light actually has interacted with the object to be photographed. The opening paragraph is obviously wrong.
Furthermore, another paragraph says:
"In ghost imaging, even though only one photon interacts with the object, both photons need to be collected to reconstruct the image, whereas in the Vienna team's work only one photon needs to be detected"
Then another one says:
"The remaining photon from the second path is also reunited with itself from the first path and directed towards a camera"
So again, the article contains a huge ambiguity, because in one paragraph it says that only one photon is needed for the photograph and then it says that one photon needs to be reunited with another photon (even if they are entangled, they are still different photons), so two photos are needed for the photograph.