Bragg-Reflection Waveguides as Practical Photon-Pair Sources for Quantum Rangefinding

Measurements of coincidence histograms (Fig. 3)

The pump power is measured before the lens of the objective, which focuses the pump laser onto the Bragg-Reflection waveguide.

number of bins of the histogram: 30 bins

phasematching wavelength: 778.808nm

pump power: 50-550µW

integration time: 1s

Measurement of signal and idler single counts

phasematching wavelength: 778.808nm

single counts per second averaged over 10 s

bw: bin width 500 ps

Measurements of signal and idler spectra (Fig. 4)

Idler and Signal darkcounts: Spectra recorded by blocking the path to the spectrometer port to collect darkcounts, then subtracted from the spectra recorded with the open shutter.

pump power: 5mW

phasematching wavelength: 778.898nm

exposure time: 300s

filter1450: long pass filter at 1450 nm to cut out the pump laser