Re: Delayed choice experiment and interstellar signalling

Willie.Mookie@xxxxxxxxx wrote:


Alright I have two experiments.

One where I always record thw which way information. Those photons
create an interference pattern that looks like particles, not waves,
and they bunch up at the center of the screen.

Another where I never record the which way information. these photons
create an interference pattern that looks like waves not particles,
and there is a dark line at the center of the screen.

I question this. In the delayed choice quantum erasure experiment they're using spontaneous parametric down conversion to create the entangled photons, so the phase of the incoming photons is lost.

The interference is between the two entangled photons, which may have been emitted from the proximity of one slit, or the proximity of the other.

So I think that if you project one of each pair of entangled photons onto a screen, you will not get an interference pattern, and nothing you do to the other set of photons will change that.

To get anywhere with your interstellar signalling system, you need a way of generating pairs of entangled photons that are also entangled with the source photons. I rather suspect that's impossible.

Sylvia.
.

Relevant Pages

  • Re: FTL by Down-converting (Revised)
    ... The following discussion of the subject faster than light (FTL) ... the signal photons corresponding to the idlers (via ... recorded data) which are "observed" do not make an interference pattern, ... lose its history. ...
    (sci.physics.research)
  • Re: Delayed choice experiment and interstellar signalling
    ... create an interference pattern that looks like particles, not waves, ... If you look at the which way information the photons travel through ... been emitted from the proximity of one slit, or the proximity of the other. ... of generating pairs of entangled photons that are also entangled with ...
    (sci.space.policy)
  • Re: OT: Quantum Enigma, part 1
    ... interference pattern and the photoelectric effect simultaneously.. ... plainly observe from the rear the impact and position of photons as ...  The second camera, a motion-picture camera, will photograph the ... camera's frame. ...
    (rec.arts.movies.current-films)
  • Re: OT: Quantum Enigma, part 1
    ... interference pattern and the photoelectric effect simultaneously. ... plainly observe from the rear the impact and position of photons as ...  The second camera, a motion-picture camera, will photograph the ... camera's frame. ...
    (rec.arts.movies.current-films)
  • Re: To AC -- on electrons
    ... First, if a wave needs a medium in which to travel, how do photons ... interference pattern. ... The Copenhagen interpretation says that until the particle is detected ...
    (talk.origins)
Loading