Figure 11

Noise reduction factor for the single-mode thermal state as a function of the mean number of photons detected at a BS output. Colored dots and error bars: experimental data obtained with the system PSAU (\(g = 10\mbox{ dB}\)) and DRS4 digitizer integrating the traces over \(\tau =70\mbox{ ns}\) (black dots) and \(\tau =110\mbox{ ns}\) (red dots); colored lines: theoretical expectations according to Eq. (5). The fitting parameters for \(\tau =70\mbox{ ns}\) are: \(\epsilon = 0.026\), \(\langle m_{\text{1dc}}\rangle = 1.406\), \(\langle m_{\text{2dc}}\rangle = 0.594\), \(t=0.958\) and \(\chi ^{(2)}=1.5\), while those for \(\tau = 110\mbox{ ns}\) are: \(\epsilon = 0.038\), \(\langle m_{\text{1dc}}\rangle = 1.515\), \(\langle m_{\text{2dc}}\rangle = 0.485\), \(t=0.930\) and \(\chi ^{(2)}=1.2\)