Bonn 2025 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 44: Quantum Technologies (Detectors and Photon Sources) (joint session Q/QI)

QI 44.6: Vortrag

Freitag, 14. März 2025, 15:45–16:00, AP-HS

A narrowband, decorrelated photon pair source based on a Ti:LiNbO₃ waveguide cavity — •Jasmin Sommer, Michelle Kirsch, Kai Hong Luo, Christof Eigner, Harald Herrmann, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn, Germany

Many applications in quantum information processing require narrowband and spectrally pure photon pairs at telecom wavelength. We developed a source for such photon pairs exploiting cavity-enhanced parametric down conversion (PDC) in a periodically poled LiNbO₃ waveguide. With coated end-faces of the waveguide, a cavity is formed. The clustering due to different free spectral ranges for TE- and TM-modes leads to spectrally narrowband photon pair generation of the type II phase-matched PDC-process. To obtain decorrelated pairs, it is furthermore necessary to pump the PDC source with tailored pulses of around 775 nm wavelength with an adaptable pulse width in the nanosecond range. We designed a suitable pump source using an electro-optic modulator for pulse carving, fiber amplifiers to boost the signal and a second harmonic stage for conversion to the pump wavelength. Details on the design of the pump source as well as initial results obtained with the photon pair source will be presented.

Keywords: cavity-enhanced SPDC; parametric down-conversion; waveguide; decorrelated photon pair source