Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 11: Quantum Optics II

Q 11.2: Talk

Monday, March 6, 2017, 17:15–17:30, P 5

Towards optimized single mode Rubidium exchanged waveguides in KTP for quantum optical applications — •Laura Padberg, Christof Eigner, Matteo Santandrea, Raimund Ricken, Helge Rütz, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn

Single mode and periodically poled potassium titanyl phosphate (KTP) waveguides are very attractive for non-linear processes in integrated quantum optics. They have been used for many different processes such as photon pair generation in telecommunication bands or coupling of photons between atomic quantum memories in the UV range to communication applications in the infrared. Moreover, a PDC source in the visible is attractive for quantum cryptography, as it allows the use of low-cost Si-APDs detectors as well as it could be coupled to ionic traps. However this technological platform is still in an exploratory stage and therefore the production of each device needs to be optimized depending on the required performances.

Rubidium-potassium-ion exchange is a practical approach for waveguide fabrication in KTP. In-house fabrication of single mode waveguides allows us to control the Rb-exchange parameters to achieve the desired results in terms of guided mode profile and waveguide losses. We show our approach in manufacturing single mode, low loss waveguides in Rb:KTP at 800nm and 1550nm. Moreover we present our progress in manufacturing PDC sources for generation of photon pairs at 800nm.