Data for "Quantum-enhanced second harmonic generation beyond the photon pairs regime"

The dataset presented here corresponds to the experimental data reported in the manuscript “Quantum-enhanced second harmonic generation beyond the photon pairs regime”.

It includes the data for:

1) Fig. 1B. SV Normalised Power Spectral Density.
- Figure1B_data.txt. SV spectrum. First column: Frequency offset from the carrier (THz rad). Second column: SV Normalised Power Spectral Density. Third column: SV Normalised Power Spectral Density with passband frequency filter.

2) Fig. 1C. Image of the SV angular spectrum.
- Figure1C_data.txt. Matrix of the image.
- Figure1C_axis.txt. Axis (both x and y) with the transverse wave vector values in 1/mm.

3) Fig. 2A. Number of Squeezed Vacuum (SV) Photons vs Number of Photons in the PDC pump.
- Figure2A_curves.txt. Theoretical curves. First Column: Number of photons in pump pulse. Second Column: Number of photons in SV pulse. Third Column: linear term
- Figure2A_data.txt. Experimental data with error bars. First Column: Number of photons in pump pulse. Second Column: Number of photons in SV pulse. Third Column: Standard deviation of photons in SV pulse.

4) Fig. 2B. Size of the SV beam vs number of photons of the SV field. Inset: Theoretical curve for the number of SV modes vs. the number of SV photons.
- Figure2B_data.txt. Experimental data with error bars. First Column: Number of photons in the SV pulse. Second Column: Beam size SV FWHM in mm. Third Column: Standard Deviation on the beam size in mm.
- Figure2B_theoretical.txt. Theoretical curve. First Column: Number of photons in the SV pulse. Second Column: Beam size SV FWHM in mm.
- Figure2B_inset.txt. First Column: Number of photons in the SV pulse. Second Column: Number of modes, Km.

5) Fig. 3A. Number of eSHG photons vs number of SV photons impinging on the SHG crystal for three different values of losses in the SV beam.
- Figure3A_data.txt. Experimental data with error bars. First Column: Number of photons in driving pulse no loss. Second Column: Number of photons in the eSHG no loss. Third Column: Standard Deviation negative of the eSHG no loss. Fourth Column: Standard Deviation positive of the eSHG no loss. Fifth Column: Number of photons in driving pulse 30% loss. Sixth Column: Number of photons in the eSHG 30% loss. Seventh Column: Standard Deviation negative of the eSHG 30% loss. Eight Column: STD positive of the eSHG 30% loss. Ninth Column: Number of photons in driving pulse 50% loss. Tenth Column: Number of photons in the eSHG 50% loss. Eleventh Column: Standard Deviation negative of the eSHG 50% loss. Twelfth Column: STD positive of the eSHG 30% loss.

6) Fig. 3B. Number of eSHG photons vs number of SV photons impinging on the SHG crystal for three different values of losses in the SV beam (Higher number of SV photons compared to Fig. 3A).
- Figure3B_no_loss_data.txt. Experimental data no loss case with error bars. First Column: Number of photons in driving pulse no loss. Second Column: Number of photons in the eSHG no loss. Third Column: Standard Deviation negative of the eSHG no loss. Fourth Column: Standard Deviation positive of the eSHG no loss.
- Figure3B_60pc_loss._datatxt. Experimental data 60% loss case with error bars. First Column: Number of photons in driving pulse 60% loss. Second Column: Number of photons in the eSHG 60% loss. Third Column: Standard Deviation negative of the eSHG 60% loss. Fourth Column: Standard Deviation positive of the eSHG 60% loss.
- Figure3B_90pc_loss_data.txt. Experimental data 90% loss case with error bars. First Column: Number of photons in driving pulse 90% loss. Second Column: Number of photons in the eSHG 90% loss. Third Column: Standard Deviation negative of the eSHG 90% loss. Fourth Column: Standard Deviation positive of the eSHG 60% loss.

7) Fig. 4A. Number of SHG photons vs number of SV photons impinging on the SHG crystal.
- Figure4A_SV_data.txt. Experimental data with error bars SV case. First Column: Number of photons in driving SV pulse. Second Column: Number of photons in the eSHG. Third Column: Standard Deviation negative of the eSHG. Fourth Column: Standard Deviation positive of the eSHG.
- Figure4A_Classical_data.txt. Experimental data with error bars classical case. First Column: Number of photons in driving coherent pulse. Second Column: Number of photons in the SHG. Third Column: Standard Deviation negative of the SHG. Fourth Column: Standard Deviation positive of the SHG.
- Figure4A_theory.txt. Theoretical curves for the SV and classical cases. First Column: Number of photons in driving SV pulse. Second Column: Number of photons in the SV driven eSHG. Third Column: Number of photons in driving coherent pulse. Fourth Column: Number of photons in the Coherent driven SHG

8) Fig. 4B. Quantum enhancement vs number of SV photons impinging on the SHG crystal.
- Figure4B_data.txt. Experimental data with error bar. First Column: Number of photons in driving SV pulse. Second Column: Measured quantum enhancement. Third Column: Standard Deviation negative of quantum enhancement. Fourth Column: Standard Deviation positive of quantum enhancement.
- Figure4B_theory.txt. Theoretical curves. First Column: Number of photons in driving SV pulse. Second Column: enhancement from eSHG. Third Column: Total enhancement.