Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 9: Photonics I

Q 9.1: Vortrag

Montag, 18. März 2013, 14:00–14:15, A 310

Frequency Down-Conversion of Single Photons — •Andreas Lenhard1, Sebastian Zaske1, Christian Keßler2, Jan Kettler2, Carsten Arend1, Christian Hepp1, Roland Albrecht1, Wolfgang-Michael Schulz2, Michael Jetter2, Peter Michler2, and Christoph Becher11Universität des Saarlandes, FR 7.2 Experimentalphysik, Campus E2.6, 66123 Saarbrücken — 2Institut für Halbleiteroptik und funktionelle Grenzflächen and Research Center SCoPE, Universität Stuttgart, 70569 Stuttgart

Establishing a quantum network over existing fiber transmission lines requires photons at low-loss telecommunication wavelengths, serving as flying qubits. To this end, photons generated by a quantum emitter in the red or near-infrared spectral region can be translated to the telecom bands via frequency down-conversion in a nonlinear medium using a strong mixing wave.

We report on the frequency down-conversion of single photons emitted by an InP/GaInP quantum dot at 710 nm to the telecom O-band at 1310 nm via difference frequency generation [1]. The strong pump field is generated by an optical parametric oscillator and mixed with the single photons in a PPLN waveguide. With an over-all conversion efficiency above 30% we were able to measure the second-order correlation function of the photons before and after conversion and prove the conservation of the single photon statistics. Furthermore, the temporal and coherence properties are also shown to be preserved.
1. Zaske et al., Phys. Rev. Lett. 109, 147404 (2012)

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