A physical photon has two transverse helicity states. Circular polarization distinguishes their populations; a real photon has no longitudinal helicity-zero polarization.

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  1. Helicity
  2. Little group
  3. Poincaré group
  4. Lorentz group
  5. Lorentz transformation
  6. Special relativity
  7. Branches of physics
  8. Physics
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