Starship Asterisk*

Yes, the idler and signal are entangled so they are identical. Your calculations is correct - the light is close to the infrared wavelengths. "the photons that build up the interference patterns should have the same frequencies as the photons that don't." - Yeah maybe - non of us can tell ...

In mean frequency of a photon = light colour. So, what is the frequency of the sigal and idler photons: 1. when we get interference? and 2. when we do not? There can easily be build up interference in the souhtern part (D1-D4) also - but for sure the most interesting stuff occurs at D0. But it is im...

I appreciate that you bother replying, but you don't seem to understand my question - maybe my english skills are poor for which I'am sorry? The contents of your last reply is basic knowlegde and I don't understand how you can assume that it would be helpful for me when taking our last messages in c...

"How exactly it works" - yeah that is the 1 million doller question and whay this expeiment has been done. But what I really refered to with the phrase was: when we don't have which-slit information, the photon is allowed to act like af wave and therefore we get interferance pattern. But a...

... and therefore it is indifferent if the motherphoton goes through A or B or A+B, because there is no why to know.

The fact that 1 photon will "become" 2 entangled photons each with 1/2 of the oiginal frequence of the "motherphoton" when hitting the BBO is surely correct :) But how it exactly works when the motherphoton interferes with itself i'm still in doubt. It would be nice if Robert cou...

Thank you for your reply.

Unfortunately it does not solve my question.

I believe you are mistakeing and that the signal and idler are indeed two different, but entangled, photons. Please note that it is the BBO-crystal that creates the two entagled photons.

Hello, after having viewed the video on the Delayed Choice Quantum Eraser, in the Classroom: Physics X, I got a question. As a single photon laser beam hits the double slit it can either go through both A and B or only A or B. This is written here: http://en.wikipedia.org/wiki/Delayed_choice_quantum...