[Aritomi, Yuhang, Yaochin, Eleonora]

First we measured frequency independent squeezing with filter cavity (Pic. 1). We had 3.5dB squeezing down to 80Hz with filter cavity.

Then we alined BAB to AMC with 1kHz filter cavity detuning and measured FDS (Pic. 2). Fitting parameters are follows. It seems that detuning changed for squeezing and anti squeezing measurement.

sqz_dB = 13;                      % produced SQZ

L_rt = 100e-6;                    % FC losses

L_inj = 0.20;                     % Injection losses

L_ro = 0.11;                      % Readout losses

A0 = 0.1;                         % Squeezed field/filter cavity mode mismatch losses

C0 = 0.1;                         % Squeezed field/local oscillator mode mismatch losses

ERR_L =   5e-12;                  % Lock accuracy [m]

ERR_csi = 80e-3;                  % Phase noise[rad]

phi_Hom = [-5/180*pi, pi/2];      % Homodyne angle [rad] 

det =  [1074 1004];               % detuning frequency [Hz]

cavity_pole = 59.6;               % cavity pole (Hz)

We measured FDS again with smaller frequency span (Pic. 3). Fitting parameters are follows. This time, it seems that produced SQZ also changed in addition to detuning.

sqz_dB = [13.5 11 13.5];          % produced SQZ

L_rt = 100e-6;                    % FC losses

L_inj = 0.20;                     % Injection losses

L_ro = 0.11;                      % Readout losses

A0 = 0.05;                        % Squeezed field/filter cavity mode mismatch losses

C0 = 0.1;                         % Squeezed field/local oscillator mode mismatch losses

ERR_L =   5e-12;                  % Lock accuracy [m]

ERR_csi = 80e-3;                  % Phase noise[rad]

phi_Hom = [-3/180*pi 70/180*pi 7/180*pi];       % Homodyne angle [rad] 

det =  [970 1005 965];                          % detuning frequency [Hz]

cavity_pole = 59.6;               % cavity pole (Hz)