Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 51: Quantum Optics IV
Q 51.6: Talk
Thursday, March 12, 2020, 15:15–15:30, f342
Correlated photon-pair emission from a cw-pumped Fabry-Perot microcavity — •Thorsten F. Langerfeld, Felix Rönchen, Hendrik M. Meyer, and Michael Köhl — Physikalisches Institut, Universität Bonn, Wegelerstraße 8, D-53115 Bonn, Germany
The generation of correlated photons is an important milestone in fundamental test of quantum mechanics and in the quest to interconnect remote quantum systems with the goal of creating quantum networks. For the latter, a tunable photon pair source, which can be tailored to the physical properties of the network nodes is desirable. For that purpose, we study a dispersion-compensated high-finesse optical Fabry-Perot microcavity under high-intensity cw pumping. The Kerr non-linearity in the optical coatings causes a spontaneous four-wave mixing process, triggered by vacuum fluctuations of the unoccupied cavity modes. Thus time-correlated photon pairs are emitted, which are shifted in frequency by ±1 free spectral range relative to the pump frequency. The ease of the experimental setup and the principal tunability of the wavelengths and bandwidths of the created photon pair make the scheme an attractive candidate for a photon-pair source with application in hybrid quantum systems in which wavelength has to be bridged between dissimilar systems. Furthermore, by filling the cavity with a synthetic silicon oil the optical non-linearity is extended over the entire cavity length which increased the pair correlation rate by a factor of more than 103 and improved the coincidence to accidental ratio by a factor of 1.7.