Recent content by mickeyp

Being new to this foum I hadn't realized, until now, that I could upload an attachment. Here is the Hessmo, et. al. experiment that I mentioned earlier. Although this experiment uses coincidence to extract a high fringe visibility, one can logically say this: observation 1: With the...

If the experimenter reduces the size of the area of radiation of signal and idler photons from the pdc, let's say by use of pinhole(s), then one would see an interference pattern behind the double slit without the use of the coincidence circuit. However, in this case, and with the Heisenberg...

I think you misread the actual Dopfer experiment. At no time was there any measurements without the coincidence circuit involvement. Both detectors were on some sort of movable platform, the detector on the lens leg was kept stationary and then the detector on the double slit side was moved to...

In Hessmo, the control in one path, after a beamsplitter, changes whether a "hit" on a detector is one photon or two photons. Due to the constant photon rate this is half as many two photon "hits" as one photon "hits". This could be thought of as the "signal" - the rate of photon bunch "hits"...

The Dopfer / Cramer thing probably is a lost cause. However, an experiment that met my eye as might show some reverse causality is: B. Hessmo, P. Usachev, H. Heydari,and G. Bjork, PhysRevLett.92.180401, 7 MAY 2004 If you can get a hold of this please note that the rotation of the...

In Dopfer the double slit is close to the pdc. Furthermore, the pdc has a finite aperature and a thickness -- which is important. The wavefunction at the double slit is phase scrambled. It is equally likely that the wavefront at bolth slits is in-phase or completely out-of-phase. Thus there...

Cramer makes a big mistake when he states that the coincidence circuit only filters a little noise. Actually the coincidence circuit is necessary to see any fringing at all. As with all the previous quantum erasure experiments, the Dopfer experiment is no different. In a quantum erasure...