Fig. 3
From: Direct observation of broadband nonclassical states in a room-temperature light–matter interface
Experimental results of convolution measurement on the correlated photons. The measured convolution of the signal (a) and idler (b) photons and the windows of cascaded cavities. Peak 1 and Peak 2 correspond to signal and idler photons, respectively. Peak 3 is explained in main text. From the spectra of signal (c) and idler (d) photons, their bandwidths can be derived as 590 and 641 MHz, respectively
