Quantum optics: Nonclassical states of light (single-photon, two-photon, three-photon and squeezed), their generation through nonlinear optical processes and from single-photon emitters; quantum nonlinear optics at the nanoscale.
Quantum metrology: sub-shot-noise measurements, quantum sensing, nonlinear interferometry.
Nonlinear optics: strongly pumped parametric down-conversion and four-wave mixing, parametric amplification.
