Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 39: Poster: Quantum Optics and Photonics II

Q 39.6: Poster

Dienstag, 6. März 2018, 16:15–18:15, Zelt Ost

Manipulation by four-photon Hong-Ou-Mandel interference — •Alessandro Ferreri, Vahid Ansari, Polina Sharapova, Christine Silberhorn, and Torsten Meier — Department of Physics and CeOPP, University of Paderborn, Warburger Strasse 100, D- 33098 Paderborn, Germany

Multiphoton quantum interference recently is in focus of research because of its possibility to extended the basis of encoding information and to improve the precision of phase measurement. Moreover multiphoton quantum interference plays significant role in quantum information science and allows investigating mesoscopic effects. In this work we focused on the Hong-Ou-Mandel (HOM) interference by involving four photons generated in KTP. Photons are created by using a type-II Parametric Down Conversion (PDC) source. By manipulation of Joint Spectral Amplitude (JSA) it is possible to change significantly the HOM-dip profile. Here we consider different shapes of JSA by increasing the laser pulse duration; different values of BS parameter (50/50 and unbalanced); different laser profile, by considering a Gaussian profile or first order Hermite-Gaussian pump laser. Our system was studied both theoretically and experimentally. We show that HOM interference profile depends on the number of Schmidt modes of PDC light and can be manipulated by laser pulse duration. We observed that by increasing the number of modes a raising of HOM dip/peak in the coincidence probability. By using BS parameters it is possible to manipulate the visibility of HOM interference. Theoretical simulations are in good agreement with the experimental results.