Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Nano-Optics III
Q 56.5: Vortrag
Donnerstag, 26. März 2015, 15:30–15:45, C/HSO
Narrow-band quantum dot single photons at the Cesium D1 transition using resonant excitation — •Tim Kroh, Andreas Ahlrichs, Andreas W. Schell, Otto Dietz, Thomas Kreißl, Chris Müller, Benjamin Sprenger, and Oliver Benson — AG Nano Optics, Institut für Physik, Humboldt-Universität zu Berlin
Quantum information applications such as quantum repeaters require indistinguishable single photons and photon pairs from distant sources. Semiconductor quantum dots fulfill the claims to have high emission rates and the capability of being integrated into small on-chip devices that emit on demand. Indistinguishability is determined by all of the photon’s properties which are the central emission wavelength, the linewidth or coherence time, the polarization as well as the time of emission. While the latter two can be easily controlled by using wave plates and electrical pumping, the emission energy of a quantum dot strongly depends on its vicinity. Optical transitions of inert gases may provide an atomic standard for stabilizing remote quantum systems to a certain wavelength.
In our experiment we investigate quantum dots that can be strain-tuned to the Cesium D1 transition via a piezoelectric substrate [1]. We use resonant excitation of quantum dots in a liquid-flow Helium cryostat to create narrow-band single photons. With the aid of a Fabry-Pérot resonator system we could resolve the Mollow-triplet indicating the presence of dressed states in the high power excitation regime.
[1] A. Rastelli et al, Phys. Status Solidi B 249, 687 (2012)