Figure 1

Signal-to-noise ratio of the ghost image as a function of the illumination level $\mathcal{I}$ for different protocols investigated in the paper. The number of detected spatiotemporal modes in a single run and the resolution parameter are fixed to be, respectively, $M=1$ and $R=100$.Reuse & Permissions

Figure 2

Signal-to-noise ratio in the covariance case (SNR) of a ghost image as a function of the illumination level $\mathcal{I}$ for twin-beam and thermal-light GI. The number of detected spatiotemporal modes in a single run and the resolution parameter are fixed to be, respectively, $M=1$ and $R=100$. (a) The three dashed curves refer to different values of the balanced detection probability ${\eta }_1={\eta }_2=\eta$. (b) The unbalanced case, where ${\eta }_1=1$ and ${\eta }_2=0.9,0.5,0.1$ from the higher to the lower curve, respectively.Reuse & Permissions

Figure 3

Signal-to-noise ratio in the covariance case (SNR) of the ghost image as a function of the illumination level $\mathcal{I}$. Here we consider an ideal lossless situation ${\eta }_1={\eta }_2=1$ and the resolution is $R=100$.Reuse & Permissions

Figure 4

Experimental setup for realizing ghost imaging with pseudothermal light.Reuse & Permissions

Figure 5

Scheme of the setup for realizing ghost imaging with twin beams produced by Type II parametric down conversion.Reuse & Permissions

Figure 6

Signal-to-noise ratio for TwGI as a function of the resolution parameter $R$. The three series of experimental data refer to the different correlation parameters considered in our analysis: $g^{(2)}$, $\text{cov}$, and $\text{var}$. They completely overlap in this regime, as well as the theoretical curves (dashed line). The theoretical curve for $G^{(2)}(R)$ is also reported (dotted line). The SNR is normalized by the square root of the number of frames of the sample $\mathcal{K}=4000$.Reuse & Permissions

Figure 7

Signal-to-noise ratio for ThGI as a function of the resolution parameter $R$. The three series of experimental data refer to the different correlation parameters considered in our analysis: $g^{(2)}$, $\text{cov}$, and $\text{var}$. They completely overlap in this regime, as well as the theoretical curves (dashed line). The theoretical curve for $G^{(2)}(R)$ is also reported (dotted line) but in experiment, no readable image could be obtained from our data set. The SNR is normalized by the square root of the number of frames of the sample.Reuse & Permissions