Squeezing the Local Oscillator Does Not Improve Signal-to-Noise Ratio in   Heterodyne Laser Radar
  The signal-to-noise ratio for heterodyne laser radar with a coherent target-return beam and a squeezed local-oscillator beam is lower than that obtained using a coherent local oscillator, regardless of the method employed to combine the beams at the detector. 
Mark A. Rubin, Sumanth Kaushik