Question is based on the ideas from
1) R. Feynman QED-Strange theory of Light. Light goes via all possible paths (e.g. reflects from all parts of the mirror.)
2) M. Kaku Visions. Photon bounced off the array of atoms sums their spins.

enter image description here
This is an image how I understand this. Is it right that particle bounced from the array of atoms sums their spins? If so, could you refer experiments of this kind?

To remove ambiguity, I should mention that arrows represent atom spin, not wave amplitude as in Feynman's book. I have added more clarifications to the question in my comments below.

  • $\begingroup$ That image, if it is from Feynman's QED book, or based on his expansion of phase, has nothing to do with electron spin. I don't know Kaku's book or the point he is trying to make, perhaps you could quote the relevant passage. $\endgroup$ – user146020 Mar 9 '17 at 22:36
  • $\begingroup$ Feynman's spinning clocks represent amplitudes and photons based on the frequency of the light. Photons do interact with every part of the mirror. The reason you see an object in the Mirror in only one spot is because The phases add up and everywhere else they cancel each other. If you stand in another location you can make that object appear at another point on the mirror proving the photons to go everywhere. Read the chapter again he explains it 1000 times better than I can. $\endgroup$ – Bill Alsept Mar 10 '17 at 6:26
  • $\begingroup$ No, sorry for the ambiguity, I did not mean to represent amplitudes. Probably, I should not mention Feynman at all. I meant to represent atom spins. I understand what Feynman mean in his book, what I am not clear is what Kaku mean saying "When a photon of light is shined on this array, the photon, as it bounced off the atoms, can flip the orientation of a particular atom from spin up to spin down. Now measure the spin of the photon after it has bounced off the array. In principle, the quantum theory has added up all possible paths that the photon could traverse and all possible spin states." $\endgroup$ – Chupakabras Mar 10 '17 at 19:47
  • $\begingroup$ What I would like to understand is what exactly Kaku mean here. He writes this in the context of quantum computing, btw. He mentions that array of atoms is in superposition. What would happen if they are not in superposition, i.e. their spins are known? Would spins still add up to the final state of the bounced off atom? $\endgroup$ – Chupakabras Mar 10 '17 at 19:55
  • $\begingroup$ I'm not sure about your question but photons don't actually bounce. A photon is absorbed and then a new photon is emitted. $\endgroup$ – Bill Alsept Mar 10 '17 at 21:10

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.