PHASE-DIFFUSION COEFFICIENTS AND PHASE-DIFFUSION RATE

We point out that the phase-diffusion rate in an amplifier or attenuator is not proportional to the phase-diffusion coefficient in the Glauber P nor the antinormal-ordering Q distribution. It is only proportional to the phase-diffusion coefficient in the Wigner (W) distribution. We also find that, for a phase-insensitive oscillator, the steady-state phase-diffusion coefficients in the P, W, and Q distributions must be identical to each other. © 1990 The American Physical Society.