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Two-photon states produce enough symmetry needed for Dirac's construction ofthe 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 inhomogeneousLorentz group which, according to Dirac, serves as the basic space-timesymmetry for quantum mechanics in the Lorentz-covariant world. Since theharmonic oscillator serves as the language of Heisenberg's uncertaintyrelations, it is right to say that the symmetry of the Lorentz-covariant world,with Einstein's $E = mc^2$, is derivable from Heisenberg's uncertaintyrelations.

Role of Quantum Optics in Synthesizing Quantum Mechanics and Relativity