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

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Two photons cannot combine to create a local field with spin 2 due to the absence of direct photon-photon interactions and the lack of a photon-photon bound state. The discussion emphasizes that there is no equivalent to a hydrogen atom for photons. Up conversion is mentioned as a related concept, but the details are not explored. The consensus is clear that photons do not interact in a way that would allow for such a combination. Overall, the topic highlights fundamental limitations in photon interactions.
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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.
 

Thread 'Angular Momentum Vector and Its Magnitude'

For the quantum state ##|l,m\rangle= |2,0\rangle## the z-component of angular momentum is zero and ##|L^2|=6 \hbar^2##. According to uncertainty it is impossible to determine the values of ##L_x, L_y, L_z## simultaneously. However, we know that ##L_x## and ## L_y##, like ##L_z##, get the values ##(-2,-1,0,1,2) \hbar##. In other words, for the state ##|2,0\rangle## we have ##\vec{L}=(L_x, L_y,0)## with ##L_x## and ## L_y## one of the values ##(-2,-1,0,1,2) \hbar##. But none of these...
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