Two-photon states produce enough symmetry needed for Diracs construction of the two-oscillator system which produces the Lie algebra for the O(3,2) space-time symmetry. This O(3,2) group can be contracted to the inhomogeneous Lorentz group which, according to Dirac, serves as the basic space-time symmetry for quantum mechanics in the Lorentz-covariant world. Since the harmonic oscillator serves as the language of Heisenbergs uncertainty relations, it is right to say that the symmetry of the Lorentz-covariant world, with Einsteins $E = mc^2$, is derivable from Heisenbergs uncertainty relations.
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