Figure 5

Pulse-height spectra for a pseudo-thermal state obtained with the system PSAU+DRS4 and integrated over \(\tau =70\mbox{ ns}\) for the different amplifier gains g indicated in the figure panels. The mean value of the pseudo-thermal state is \(x_{\text{out}}/\bar{\gamma }\sim 14\). The corresponding visibility values are (a): \(v = 0.39 \pm 0.04\), (b): \(v = 0.43 \pm 0.05\), (c): \(v = 0.49 \pm 0.04\) and (d): \(v = 0.70 \pm 0.06\)