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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.53: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Towards quantum frequency down-conversion of indistinguishable single photons — •Benjamin Kambs, Andreas Lenhard, Matthias Bock, Richard Nelz, and Christoph Becher — Universität des Saarlandes, FR 7.2 Experimentalphysik, 66123 Saarbrücken, Germany

Establishing quantum communication networks over long distances requires photons within one of the low-loss telecom bands of optical fibers, most commonly around 1310 nm (telecom O-band) or 1550 nm (telecom C-band). However, single-photon sources typically emit at wavelengths of electronic transitions in the visible or near infrared range. One approach to overcome this gap is to employ nonlinearities of solid state systems in order to convert the frequency of the photons. Whilst the conversion of single photons conserving their non-classical anti-bunching behavior has been shown already, the impact of conversion on indistinguishabilty has to be investigated, yet.
Here we propose a frequency down-conversion setup, converting single photons emitted at 905 nm by InAs/GaAs quantum dots to the telecom C-band and show first experimental results regarding its performance. The setup will be used to test the indistinguishability of subsequently converted photons via HOM-interference measurements. Furthermore wavelength differences between two photons emitted by spatially separated quantum dots are to be compensated via frequency conversion in order to create indistinguishability.