How to evaluate whether a photon's polarization is in superposition?

[fluidfcs]

Is there an accepted experimental methodology for determining whether a photon's polarization is in superposition or not?

 

[DrClaude]

It is always in a superposition in some basis.

 

[Ahmed1029]

Is there an accepted experimental methodology for determining whether a photon's polarization is in superposition or not?

I think of quantum superposition the same way I think of electric field superposition. An electric field vector exists in space and is always a superposition of its components in some basis. The same thought is applicable for quantum superposition.