Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 38: Poster IV
Q 38.37: Poster
Mittwoch, 13. März 2024, 17:00–19:00, KG I Foyer
Monolithic source for narrow-band photon pairs using down-conversion in ppKTP — •Leon Meßner1, Helen Chrzanowski1, and Janik Wolters1,2 — 1Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institute of Optical Sensor Systems, Berlin, Germany — 2Technische Universität Berlin, Institut für Optik und Atomare Physik, Berlin, Germany
We present first results and future prospects for a photon-pair source based on spontaneous parametric down-conversion (SPDC) in a periodically poled monolithic KTP crystal cavity[1]. By proper engineering of the cavity parameters and phase-matching, it is possible to tune the source for interfacing with atomic systems and particularly with quantum memories.
By putting the cavity end mirrors directly on the non-linear crystal we have build a photon-pair source that is set to a dedicated signal and idler wavelength of 895 nm with a bandwidth of 250 MHz and a cavity finesse of 90 while retaining a tuneability of 20 GHz. The source emits photon pairs at a rate of 40 kcts/s with an heralding efficiency of 38%, limited by the current choice of collimation optics.
We plan on interfacing our source with a warm vapor EIT quantum memory[2] to explore synchronizing the probabilistic photon source to a fixed clock rate. In addition to investigating typical parameters of quantum memories such as efficiency and maximum storage time, we will measure the attainable two-photon interference between a photon retrieved from the memory and one directly from the source.
[1] Mottola, R. et al., Optics Express 28, 3159-3170 (2020)
[2] Buser, G. et al., PRX Quantum 3, 020349 (2022)
Keywords: SPDC; photon sources