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originally posted by: Arbitrageur
PS this is the correct link, your link didn't work:
How light is detected affects the atom that emits it
originally posted by: TinfoilTP
O if we detect a photon from a galaxy 10 billion light years away, we can effect the atom that emitted the photon even though the atom does not exist any longer after 10 billion years? If so this is time travel back in time.
Experiments that involve entanglement exhibit phenomena that may make some people doubt their ordinary ideas about causal sequence. In the delayed choice quantum eraser, an interference pattern will form on D0 even if which-path data pertinent to photons that form it are only erased later in time than the signal photons hit that primary detector. Not only that feature of the experiment is puzzling; D0 can, in principle at least, be on one side of the universe, and the other four detectors can be "on the other side of the universe" to each other.[21]
However, the interference pattern can only be seen retroactively once the idler photons have been detected and the experimenter has had information about them available, with the interference pattern being seen when the experimenter looks at particular subsets of signal photons that were matched with idlers that went to particular detectors.[21]
The total pattern of signal photons at the primary detector never shows interference (see Fig. 5), so it is not possible to deduce what will happen to the idler photons by observing the signal photons alone. The delayed choice quantum eraser does not communicate information in a retro-causal manner because it takes another signal, one which must arrive via a process that can go no faster than the speed of light, to sort the superimposed data in the signal photons into four streams that reflect the states of the idler photons at their four distinct detection screens.
Delayed choice quantum eraser - Wikipedia
originally posted by: ConnectDots
a reply to: Bedlam
. . . tau axis reversal of light . . .
A search of ATS brought no results.
Do you remember which forum the former discussion took place on?
"Tau axis" doesn't bring up a dictionary definition, either - only internet links. The first one references "tau axis hypothesis" of Alzheimer's disease. Did the discussion relate more to biology than physics?
originally posted by: Bedlam
a reply to: BO XIAN
Hint, hint - this has some cool implications that relate to other things that were discussed on ATS long ago about tau axis reversal of light, virtual photons, et al.
Eh, someone's finally diddling with this officially.
originally posted by: ConnectDots
a reply to: BASSPLYR
Gee I wish I knew what you are talking about!
I mean it's obvious you're joking but I don't know what kind of joke.
originally posted by: GBP/JPY
it's more supernatural than that.....more magic than science
I figured that out when I discovered the visual ray.....
if you look at a cloud it disintegrates.....in just 2.6 minutes.....take that......pick a distinct puffy one....you'll see the first sign in just 60 seconds.....stare that kills, huh
originally posted by: Bedlam
a reply to: ConnectDots
It gets about as oddball as you want. There is a targeting system with no moving parts and no computational logic that uses this effect to correct aim and collimation of a laser using virtual photons ptopagating backwards in time so that the aim was never off because it was always right...it's the stuff of headaches.