Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.37: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent B

A nanosecond pulsed light source as pump source for narrowband, decorrelated photon pairs — •Jasmin Sommer, Michelle Kirsch, Kai Hong Luo, Harald Herrmann, and Christine Silberhorn — Universität Paderborn, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, D-33098 Paderborn

Narrowband and spectrally decorrelated photon pairs are a prerequisite for many applications in quantum processing. A common way to generate single photon pairs is to use parametric down conversion (PDC) sources. Exploiting clustering within a cavity allows the generation of spectrally narrowband photon pairs. Decorrelated pure states can be further obtained by pumping the source with pulses of well-defined properties. We have developed a pump source dedicated for pumping cavity-enhanced PDC in a periodically poled waveguide in LiNbO₃. To generate photon pairs in the telecom range, this requires Gaussian shaped pulses around 775 nm with an adjustable pulse length in the nanosecond range. We have constructed such a pump source starting with a cw laser at 1550 nm. An electro-optical modulator is used to generate specifically tailored pulses of well-defined duration. These are amplified in erbium doped fiber amplifiers and converted to the 775 nm range via second harmonic generation in a periodically poled bulk LiNbO₃ crystal. We report details on the design and characterization of the pump source and initial experiments towards the generation of decorrelated photon pairs.

Keywords: PDC; pump source