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Future optical quantum networks could benefit from single photons that couplewell to atoms, for realizing, e.g., quantum memories and deterministic photonicgates. However, the efficient generation of such photons remains a difficultchallenge. Recently, we demonstrated a bright multiplexed source ofindistinguishable single photons with tunable GHz-bandwidth based onfour-wave-mixing in rubidium vapor [Davidson et al. 2021 New J. Phys. 23073050]. Here we report on an improved implementation of this photon source.The new implementation employs a frequency-detuning regime that is better phasematched, a spatial-alignment procedure using single-mode fibers, a differentrubidium isotope, and higher vapor-cell transmission. Characterization of thesource is performed using superconducting-nanowire detectors with higherdetection efficiency and lower jitter. Our source produces single photons withdetected heralding efficiency of over 20%, Hong-Ou-Mandel interferencevisibility of 88%, generation rate of over 100 kilo-counts per second, andsignal-to-noise ratio greater than 100, making it suitable for quantuminformation processing with photons.

Bright, low-noise source of single photons at 780 nm with improved phase-matching in rubidium vapor