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. 2015 Sep 14;6:8236. doi: 10.1038/ncomms9236

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(a) Measured photon coincidence peak, showing the raw measured coincidences (C) in Hz. The black curve corresponds to the optimum fit resulting in a measured photon bandwidth of 320 MHz, while the red curve corresponds to the fit with the expected photon bandwidth of 410 MHz. (b) CAR (coincidence-to-accidental ratio) as a function of balanced pump power (the line connecting the points is just for visual purposes), showing a CAR >10 for balanced pump powers between 3 and 5 mW. (c) Measured photon coincidence counts (sum of all coincidence counts measured within the FWHM of the coincidence peak) for balanced and unbalanced pump powers. In the unbalanced configuration (blue circles), the TE pump power is kept constant at 6 mW and the TM pump power is increased, showing a linear scaling behaviour. In the balanced configuration (red squares), TE and TM pump powers are identically increased, showing a clear quadratic scaling behaviour without any linear contribution.