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Q: Fachverband Quantenoptik und Photonik
Q 43: Quantum Technologies
Q 43.8: Poster
Wednesday, March 16, 2022, 16:30–18:30, P
Towards on-chip pump filtering of quantum light sources — •Julian Brockmeier1, Nina Lange1, Thomas Hummel1, Maximilian Protte1, Viktor Quiring2, Raimund Ricken2, Harald Herrmann2, Christof Eigner2, Christine Silberhorn2, and Tim Bartley1 — 1Mesoskopische Quantenoptik, Department Physik, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — 2Integrierte Quantenoptik, Department Physik, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
Our goal is the realization of on-chip experiments including spontaneous down-conversion sources (SPDC) and detection by superconducting integrated detectors at cryogenic temperatures. The integration of the source on-chip is realized by using periodically poled lithium niobate waveguides. However, in order to be able to differentiate the created photon pairs from the pump light it is crucial to suppress the latter by at least 100 dB. This must be realized while maintaining low losses for the quantum light. We present approaches towards on-chip pump filtering by utilizing various effects such as wavelength selective routing and reflective coatings. Another key factor is the dispersion of pump and signal due to the different group velocities in the crystal, which can take advantage of with our high-speed response of superconducting integrated detectors.