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Q: Fachverband Quantenoptik und Photonik

Q 51: Quantum information: Photons and nonclassical light III

Q 51.1: Vortrag

Donnerstag, 20. März 2014, 16:30–16:45, UDL HS3038

A monolithic polarization-independent frequency filter system for experiments in quantum optics — •Christoph Berkemeier, Andreas Ahlrichs, Benjamin Sprenger, and Oliver Benson — AG Nano-Optik, Institut für Physik, HU Berlin

We present a filter system based on cascaded monolithic Fabry-Pérot cavities[1,2]. The resonance frequency can be selected by temperature-tuning of the cavity material. This results in excellent rms resonance frequency deviation of just 4.5 MHz in 20 h. By combining two filters we achieved an effective free spectral range of several hundred GHz with a linewidth of 200 MHz. The individual filters are coupled to single-mode fibers each with a transmission of up to 85 % on resonance. Undesired birefringence, which often plagues monolithic cavities, was avoided by stress-free mounting.
The system was used to filter photons of a cavity-enhanced parametric down-conversion source. It was applied as a high resolution monochromator to measure the comb-like spectrum of the generated photon pairs. The indistinguishability of the photons was verified with the Hong-Ou-Mandel effect, which was measured with a visibility of 96 %.
We report experiments towards creating indistinguishable photons from dissimilar sources (e.g. quantum dots and the photon pair source).

[1] Ahlrichs et al., Appl. Phys. Lett. 103, 241110 (2013)

[2] Palittapongarnpim et al., Rev. Sci. Instrum. 83, 066101 (2012)