Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 8: Quantum Optics II
Q 8.8: Talk
Monday, March 23, 2015, 16:15–16:30, C/HSO
Single photon absorption by a single atom heralded by a telecom-converted single photon — •Stephan Kucera, José Brito, Andreas Lenhard, Pascal Eich, Philipp Müller, Christoph Becher, and Jürgen Eschner — Experimentalphysik, Universität des Saarlandes, Saarbrücken, Germany
The use of hybrid atom-photon quantum systems takes advantage of the best features of the involved platforms: long storage times, fast processing capabilities, high quality entanglement and long haul fiber transmission. Such properties are prerequisites for the implementation of a quantum communication network.
We present a system where the absorption of a single photon by a single trapped ion is heralded at a telecommunication wavelength by the detection of a frequency-converted single photon. Twin photons are generated by a spontaneous parametric down conversion heralded photon source. One of the photons of the pair is sent to, and absorbed by, a single trapped 40Ca+ ion while its partner photon is sent through 90 meters of fiber and converted to telecom wavelength using a waveguide-based frequency converter set-up placed in a different laboratory. The time correlation between the detection of the converted photon and a quantum jump at the ion’s side shows a successful single photon absorption by the trapped ion.