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I am trying to better understand the following:

What is the difference between Intraphoton Entanglement and Interphoton Entanglement?

I am new in this field and i want to proceed some work on swapping of Intraphoton Entanglement to Interphoton Entanglement.

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    $\begingroup$ where is this terminology from? $\endgroup$
    – glS ♦
    Dec 20, 2019 at 13:10

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Intraphoton entanglement uses the degrees of freedom from one photon only to create entanglement. So, here either polarization and linear momentum or polarization and angular momentum can be used to create entanglement. Interphoton entanglement is the entanglement created between 2 spatially separated photons. So, naturally latter is less stable than former. For this reason, this paper used former as a resource to create latter.

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  • $\begingroup$ "So, naturally latter is less stable than former" this seems quite a generic statement. Have you got a source for that? One can think of all sorts of type of entanglement shared by different photons or internal dofs of a single photon, and I would expect the stability of which to be highly dependent on the experimental circumstances $\endgroup$
    – glS ♦
    Dec 29, 2019 at 10:42
  • $\begingroup$ Yeah, my comment was a bit generic. I should have specified it with respect to the discussion of degrees of freedom. To add to my previous comment, according to the third paper I linked, two degrees of freedom within one photon are easier to maintain than between two photons. $\endgroup$
    – Purva Thakre
    Dec 31, 2019 at 5:51

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