Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 84: Poster: Quantum Networks

FM 84.5: Poster

Donnerstag, 26. September 2019, 16:30–18:30, Tents

Polarization-preserving quantum frequency conversion for entanglement distribution in quantum networks — •Matthias Bock1, Stephan Kucera1, Robert Garthoff2, Tim van Leent2, Kai Redeker2, Pascal Eich1, Matthias Kreis1, Wenjamin Rosenfeld2,3, Tobias Bauer1, Harald Weinfurter2,3, Juergen Eschner1, and Christoph Becher11Universität des Saarlandes, Campus E2.6, Saarbrücken, Germany — 2Fakultät für Physik, Ludwig-Maximilians-Universität, Munich, Germany — 3Max-Planck-Institut für Quantenoptik, Garching, Germany

Entanglement between a stationary quantum system and a photonic flying qubit is an essential ingredient of a quantum-repeater network. Most stationary quantum bits, however, have transition wavelengths in the blue, red or near-infrared spectral regions, whereas long-range fiber-communication requires wavelengths in the low-loss telecom regime. A proven tool to interconnect flying qubits at visible/NIR wavelengths to the telecom bands is quantum frequency conversion.
Here we will show an efficient and low-noise polarization-preserving frequency converter connecting 854 nm – a transition wavelength in a single trapped 40Ca+-ion – to the Telecom O-band at 1310 nm. This enables the observation of ion-telecom-photon entanglement as well as an ion-to-telecom-photon state transfer. Moreover we will present a complete QFC system designed as telecom interface for an elementary Rubidium-atom based quantum network link. As a first result, the entanglement between a single Rb-atom and a telecom photon transmitted through an optical fiber of 10 km length is shown.

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DPG-Physik > DPG-Verhandlungen > 2019 > Freiburg