What is an anti-photon and do they even exist?

Answer 1

Quantum field theory requires for consistency reasons that every charged particle has its antiparticle. If the particle is uncharged then quantum field theory does not put any other impulsion and so we do not need antiparticles for photons. The reason behind it is that they are not charged. But you can still consider the same operation of keeping mass and spin and exchanging charges and since the photon remains unaffected by this, you can decide to identify it with an antiphoton. So it depends on you whether or not you want to consider photons to have antiphotons or not.

Answered by Tanishq Choudhary

Answer 2

The photon is its own antiparticle. In other words, the antiphoton is the same as the photon.