Graduate Feynman rules for Entangled photons

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The discussion centers on the application of Feynman path integrals to entangled photons, specifically whether the amplitude of one photon should include the amplitude of its entangled partner. Participants emphasize that to compute a path integral, one must define endpoints for both photons, considering them as a single entity in a six-dimensional configuration space. The conversation highlights that entangled photons do not interfere in the traditional sense and that their behavior cannot be treated as independent particles. It is clarified that the concept of "collapse" of the wavefunction does not apply distinctly to each photon in the pair. Ultimately, the complexities of the path integral formulation for entangled photons require careful consideration of their joint behavior rather than treating them separately.
  • #31
Quant said:
There is not such thing as Feynman rules.
What? Of course there are. And if you don't think there are, why did you put them in the thread title?
 
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  • #32
Quant said:
There is not such thing as Feynman rules.
Yes, there are. They just don't mean what your thread title implies that they mean, as @Demystifier pointed out in post #26.

Quant said:
If you think it is B level
We don't. That's the point. We think the questions you are asking are A level, but your level of knowledge is not. Your level of knowledge appears to be B level, and there is no useful answer we can give you at B level. The only useful feedback we can give you at B level is to increase your level of knowledge. Study textbooks that deal with path integrals for multiple-particle systems. Then you will be able to frame questions that we can usefully answer.

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