Erlangen 2018 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 51: Poster: Quantum Optics and Photonics IV
Q 51.63: Poster
Wednesday, March 7, 2018, 16:15–18:15, Redoutensaal
Amplification of high orbital angular momentum modes in a nonlinear interferometer — •Johan Ospina1,2, Roman Zakharov3, Olga Tikhonova3, and Maria Chekhova1,2,3 — 1Max Planck Institute for the Science of Light, Staudtstrasse 2, 91058 Erlangen, Germany — 2University of Erlangen-Nürnberg, Staudtstrasse 7/B2, 91058 Erlangen, Germany — 3Department of Physics, M. V. Lomonosov Moscow State University, Leninskie Gory, 119991 Moscow, Russia
We study the orbital angular momentum (OAM) modes of bright squeezed vacuum (BSV). BSV is produced via high-gain parametric down conversion and it manifests quantum features despite its high (macroscopic) numbers of photons. In particular, its modes with opposite OAM values have the same photon numbers and therefore it is possible to observe quantum correlations between them. However, the observation of such correlations requires the efficient lossless sorting of OAM modes. Because the sorting of higher-order modes with opposite OAM values is easier, we are going to shape the spectrum of BSV in such a way that low-order OAM modes are suppressed. For this we use a Michelson-type nonlinear interferometer where BSV is generated in a nonlinear crystal and then gets reflected back into the same crystal together with the pump, which takes a separate path. By using additional optical elements inside the interferometer we provide the selective amplification of specific OAM modes. The OAM spectrum is studied by analysing the photon-number correlations in the output angular spectrum.