Recent content by marksesl

Hello, I was studying the Bell-state quantum eraser and saw that they placed quarter-wave plates in front of each slit to mark the photons with either clockwise polarization or counterclockwise polarization that were previously either horizontally or vertically polarized. So, now I'm wondering...

That's very helpful. Thank you.

So, this seems to be another complementarity issue. Before tackling just how this impacts the experiment, I want to focus on the more fundamental issues: 1) How knowing, or at least being able to know, which-way information appears to cause wave-function collapse. 2) Retrocausality. In...

Ok, I understand the filtering process. The entangled photons produced by the BBO crystal are no longer coherent since the pairs only need to have wavelengths that add up to the wavelengths of the parent photos, rather than being exactly half. So, in these entangled photon experiments the...

Ok then the photon pairs are not produced simultaneously. Correct? So then what is doing the interfering at D0? A single photon can't just go there by itself and form an interference pattern. And getting back to the double slits. I still say that the photon's wave function must be...

As shown, there is a double slit, followed by the BBO crystal. A photon's wave function supposedly traverses both slits in a double slit, which, in conventional experiments results in the interference pattern. Two sets of entangled pairs are made in this particular configuration, a pair from...

Not in the Bell-state configuration. You are referring to the other one where you have the B0 detector and the mirrors that lead to the other four detectors. I actually don't understand how interference takes place there at all, unless the signal photos from both slot A and slot B are...

Has anyone read the description of the double slit experiments on this site? They claim that a detector if left on, but with the recording tape removed will still result in the fringe pattern being restored. I don't believe it. It just can't be...

Ok, so in the Bell state quantum eraser configuration an entangled pair is produced by the BBO crystal. One is shot through the double slits, while the other is shot at the other detector. So are you saying this is a one photon or a two photon experiment. After all, one is going through the...

I fully understand no.1. The patterns are seen only after incidence pairs are plotted. But, if entangled photons don't interfere, how can there ever be an interference pattern made, with or without incidence counting?

Ok, thanks. I have that paper printed out actually. I'll check it out. So, then this is differently one reason for doing incidence counting, pick out coherent light from the mass of incoherent light made up of the incoherent entangled photons, which are comprised of a spectrum of different...

I don't see how doing coincidence counting changes anything about the essence of the experimental results. Each idler photon's entangled signal photon pal still struck the D0 detector first and had its location recorded (time paradox) while the idler was still in flight, and all the signal...

But, there is no mention of this being done in the delayed choice quantum experiments.

Your remarks are quite informative. As I understand it now, the photons from the BBO crystal are no longer coherent because entangled pairs do not have to be equal in frequency, but just have frequencies that add up to their parent photons. The entangled pairs represent kind of rainbow of all...

Anyone can do a very similar quantum eraser experiment at home using two linear polarizing filters and one diagnal filter, a laser pointer, and a piece of foil with two slits cut in it. There is no need for an incidence counter. Just how to proceed with this experiment should be obvious...