Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 5: Quantum Optics I
Q 5.7: Vortrag
Montag, 29. Februar 2016, 12:30–12:45, f442
Low-noise quantum frequency down-conversion of indistinguishable photons — •Benjamin Kambs1, Jan Kettler2, Matthias Bock1, Jonas Becker1, Carsten Arend1, Michael Jetter2, Peter Michler2, and Christoph Becher1 — 1Fachrichtung 7.2 (Experimentalphysik), Universität des Saarlandes, Campus E 2.6, 66123 Saarbrücken, Germany — 2Institut für Halbleiteroptik und Funktionelle Grenzflächen, Research Centers SCoPE und IQST, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany
Single-photon sources based on quantum dots have been shown to exhibit almost ideal properties such as high brightness and purity in terms of clear anti-bunching and high two-photon interference visibilities of the emitted photons. In order to prepare them for quantum communication applications including long-haul photon transmission via optical fibers, quantum frequency down-conversion (QFDC) has been used to alter the wavelength of single photons to the telecom wavelength range while conserving their nonclassical properties. Here we present experimental results on QFDC of single photons emitted by a p-shell excited InAs/GaAs quantum dot at 903.6 nm. The fluorescence photons were down-converted to 1557 nm with an efficiency >25 %. An indistinguishability measurement revealed two-photon interference contrasts of more than 40 % prior to and after the down-conversion. As a result, we demonstrate that our scheme preserves photon indistinguishability and can be used to establish a versatile source of indistinguishable single photons at the telecom C-Band.