== Photon article says that a photon has two possible polarization states == 

 The Photon article says that a photon has two possible polarization states.  This article does not refer to this, but describes the polarization state in terms of a Jones vector, which has three parameters.  These two statements seem very inconsistent, and there doesn't seem to be any explanation linking the two.  Is there a standard way to represent a polarization state using two parameters?