Thorsten F Langerfeld, Hendrik M Meyer, and Michael Köhl:
Phys. Rev. A, 97, 023822 (2018)
🔓 arXiv:1711.04424 (2017)
We study a dispersion-compensated high-finesse optical Fabry-Perot microcavity under high-intensity cw pumping. The Kerr nonlinearity in the optical coatings causes a spontaneous four-wave mixing process, which leads to the emission of time-correlated photon pairs. The photon frequencies are shifted by ±1 free spectral range relative to the pump frequency. This setup allows for constructing a photon-pair source with precisely adjustable frequency difference between the emitted photons, which may have applications in quantum communication.