Freiburg 2019 – scientific programme
Sessions | Days | Selection | Search | Updates | Downloads | Help
FM: Fall Meeting
FM 9: Quantum Networks: Platforms and Components I
FM 9.6: Talk
Monday, September 23, 2019, 15:15–15:30, 1098
Polarisation Modulation in Lithium Niobate Waveguides at 0.8K — •Frederik Thiele1, Jan Philipp Höpker1, Patrick Bartkowiak2, Felix vom Bruch2, Viktor Quiring2, Raimund Ricken2, Christof Eigner2, Christine Silberhorn2, and Tim J. Bartley1 — 1Mesoskopische Quantenoptik, Department Physik, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — 2Integrierte Quantenoptik, Department Physik, Universität Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
Lithium niobate is an important platform for integrated quantum photonics given its high second-order nonlinearity and electro-optic properties. In this material, high-speed electro-optic modulation and polarization conversion can be realised, typically at room temperature. However, superconducting detectors as well as some other quantum optic devices require cryogenic temperatures to operate. The aim of this work is to implement modulators at cryogenic temperatures to demonstrate that these techniques have compatible operating conditions. We report on the realisation of a cryogenic polarisation modulator at 0.8K, based on periodically poled, titanium in-diffused lithium niobate waveguides. High coupling efficiency from single mode fibres from room temperature to the device inside a closed cycle cryostat have been realised, as well as adapting quasi-phase matching to cryogenic temperatures.