I Can two photons combine to give a local field with spin 2?

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Can two photons combine to give a local field with spin 2
Can two photons combine to give a local field with spin 2
 
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No. They cannot. There is no direct photon-photon interaction, nor a photon-photon bound state (similar to a hydrogen atom, for example).
 
Thank you very much dextercioby for attend me. Best regards.
 
dextercioby said:
No. They cannot. There is no direct photon-photon interaction, nor a photon-photon bound state (similar to a hydrogen atom, for example).
What about up conversion? (Opposite of down conversion). Admittedly I don’t know much about that other than the name.
 
We often see discussions about what QM and QFT mean, but hardly anything on just how fundamental they are to much of physics. To rectify that, see the following; https://www.cambridge.org/engage/api-gateway/coe/assets/orp/resource/item/66a6a6005101a2ffa86cdd48/original/a-derivation-of-maxwell-s-equations-from-first-principles.pdf 'Somewhat magically, if one then applies local gauge invariance to the Dirac Lagrangian, a field appears, and from this field it is possible to derive Maxwell’s...
I read Hanbury Brown and Twiss's experiment is using one beam but split into two to test their correlation. It said the traditional correlation test were using two beams........ This confused me, sorry. All the correlation tests I learnt such as Stern-Gerlash are using one beam? (Sorry if I am wrong) I was also told traditional interferometers are concerning about amplitude but Hanbury Brown and Twiss were concerning about intensity? Isn't the square of amplitude is the intensity? Please...
I am not sure if this belongs in the biology section, but it appears more of a quantum physics question. Mike Wiest, Associate Professor of Neuroscience at Wellesley College in the US. In 2024 he published the results of an experiment on anaesthesia which purported to point to a role of quantum processes in consciousness; here is a popular exposition: https://neurosciencenews.com/quantum-process-consciousness-27624/ As my expertise in neuroscience doesn't reach up to an ant's ear...
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