Berlin 2014 – wissenschaftliches Programm

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SYQR: Symposium Quantum Repeater

SYQR 4: Photon Sources for Quantum Networks

SYQR 4.4: Vortrag

Dienstag, 18. März 2014, 14:45–15:00, Kinosaal

Interfacing telecommunication and UV wavelengths — •Helge Rütz, Kai-Hong Luo, Hubertus Suche, and Christine Silberhorn — Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn

Changing the color of a photonic quantum state by means of coherent frequency conversion allows to interface short-wavelength stationary qubit systems and low-loss photonic channels at telecommunication wavelengths.

Here, we report on such an interface for quantum states of light between trapped ions at 369.5 nm and telecommunication wavelengths around 1310 nm. More specifically, we employ a single-pass quasi-phasematched second-order nonlinear interaction in a periodically poled Potassium Titanyl Phosphate- (KTP-) waveguide in conjunction with a strong cw-pump field at 515 nm.

We present experimental details of our interface, showing bright-light conversion efficiencies of up to 10%. Non-phasematched spontaneous parametric downconversion of pump photons is identified as the major limitation in the achievable signal-to-noise-ratio on the single-photon-level.

Finally, the potential use of our frequency conversion interface in quantum information technology is discussed.