Dirac and Squeezed States

Paul A. M. developed the concept of squeezed states in two different ways.
  1. Space-time Squeeze. By introducing his light cone coordinate system he observed that the Lorentz boost is a squeeze transformation.

  2. Two-photon States. By constructing an algebra for two coupled harmonic oscillators, he worked out the symmetry of two-photon states.

    Let us discuss these issues in detail.

1. Space-time Squeeze

2. Dirac's Two-photon States