Fig. 3: Phase sensitivity measurements with 15 dB input squeezing and Nα = 1500 photons in the coherent beam.
From: Overcoming detection loss and noise in squeezing-based optical sensing
The red dashed line marks the SNL and the solid lines are the theoretical predictions. The error bars represent the standard error of the mean with a sample size of 1000. The insets show the photon number dependence on the phase and the error bars are too small to be seen. a Parametric amplification with G2 = 3.1. Circles, triangles and crosses show measurements with detection efficiency η = 50%, 29% and 15%, respectively. b Parametric amplification with G2 = 3.6. Circles, triangles and crosses are for η = 50%, 16% and 6%, respectively.
