Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 40: Poster: Quantum Optics and Photonics II
Q 40.33: Poster
Mittwoch, 8. März 2017, 17:00–19:00, P OG2
Pulse shaping of single photons with pulsed cavity SPDC sources — •Simon Laibacher1 and Vincenzo Tamma1,2 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, D-89069 Ulm, Germany — 2Faculty of Science, SEES, University of Portsmouth, Portsmouth PO1 3QL, UK
Cavity-enhanced spontaneous parametric down conversion (SPDC) is used extensively as a light source in quantum optics. Such sources are nowadays often integrated into waveguides where high finesses cannot easily be achieved and thus reservoir theory cannot be applied to describe the coupling of the cavity. Recently, a description of such sources for arbitrary sub-threshold gain has been published for continuous pumping [1].
Our work aims to extend this description by including a finite phase matching bandwidth and allowing for a pulsed operation of the source.
We derive the general Bogolioubov transformation between the input and output fields of the cavity for Type-II SPDC under these conditions. Our approach allows us to easily calculate arbitrary correlation functions of the generated two-mode state.
We then use our formalism to investigate how the shape of the pump pulse and post-selection in the heralding time of the idler photons can be employed to engineer the shape of the signal photons. Further, corrections to the signal-idler cross correlation function reported in [1] are found in the limit of near-threshold squeezing.
[1] Zielińska and Mitchell, Phys. Rev. A 90, 063833 (2014).