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Hong-Ou-Mandel (HOM) interference, the bunching of two indistinguishablephotons on a balanced beam-splitter, has emerged as a promising tool forquantum sensing. There is a need for wide spectral-bandwidth photon pairs (forhigh-resolution sensing) with high brightness (for fast sensing). Here we showthe generation of photon-pairs with flexible spectral-bandwidth even usingsingle-frequency, continuous-wave diode laser enabling high-precision,real-time sensing. Using 1-mm-long periodically-poled KTP crystal, we produceddegenerate, photon-pairs with spectral-bandwidth of 163.42$\pm$1.68 nmresulting in a HOM-dip width of 4.01$\pm$0.04 $\mu$m to measure a displacementof 60 nm, and sufficiently high brightness to enable the measurement ofvibrations with amplitude of $205\pm0.75$ nm and frequency of 8 Hz.Fisher-information and maximum likelihood estimation enables optical delaymeasurements as small as 4.97 nm with precision (Cram\'er-Rao bound) andaccuracy of 0.89 and 0.54 nm, respectively, therefore showing HOM sensingcapability for real-time, precision-augmented, in-field quantum sensingapplications.

Near-video frame rate quantum sensing using Hong-Ou-Mandel interferometry