Erlangen 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 47: Quantum Information (Quantum Repeater)
Q 47.4: Vortrag
Mittwoch, 7. März 2018, 15:00–15:15, K 1.020
Remote two-photon interference at 1550 nm via quantum frequency conversion of quantum dot photons — •Benjamin Kambs1, Jonas Heinrich Weber2, Jan Kettler2, Simon Kern2, Matthias Bock1, Hüseyin Vural2, Simone Luca Portalupi2, Michael Jetter2, Christoph Becher1, and Peter Michler2 — 1Universität des Saarlandes, Naturwissenschaftlich-Technische Fakultät, Campus E2.6, 66123 Saarbrücken, Germany — 2Institut für Halbleiteroptik und Funktionelle Grenzflächen, Research Centers SCoPE und IQST, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany
Quantum repeaters constitute a major milestone in establishing fiber-based quantum networks. Ideally, such networks are built upon a pool of identical emitters providing indistinguishable telecom photons. However, the achieved two-photon interference (TPI) visibilities of solid state telecom quantum emitters fall short of corresponding systems at shorter wavelengths so far. Moreover, solid state sources typically show mismatched emission frequencies and need to be tuned into resonance. Here we employ efficient quantum frequency down-conversion (QFDC) to meet both prerequisites: near infrared photons emitted by two distinct semiconductor quantum dots are transferred to a common wavelength in the telecom C-band. Subsequently testing their mutual indistinguishability, we obtain a TPI visibility of 25 % solely limited by spectral diffusion. Our results show that QFDC can be used to integrate state-of-the-art emitters into quantum networks and thus constitute a basic building block of quantum repeaters.