Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 58: Poster: Quantum Optics and Photonics III
Q 58.20: Poster
Thursday, March 14, 2019, 16:15–18:15, S Atrium Informatik
Two single photon sources for rubidium transitions — •Eduardo Urunuela1, Wolfgang Alt1, Yan Chen2, Robert Keil2, Tobias Macha1, Deepak Pandey1, Hannes Pfeifer1, Lothar Ratschbacher1, Michael Zopf2, Fei Ding2, Oliver G. Schmidt2, and Dieter Meschede1 — 1Institut für Angewandte Physik, Uni Bonn, Germany — 2Leibniz IFW, Dresden, Germany
We compare an atom-cavity based single-photon source with the emission of a frequency-stabilized quantum dot [1]. While the solid-state system offers single-photon generation at a high rate, a rubidium atom coupled to a fiber-based, high-bandwidth optical resonator [2] gives the possibility to design the temporal envelope of the photons.
In the adiabatic limit, we use optimized control pulses for single-photon generation by adapting the impedance-matching based storage scheme of Dilley et al. [3] and the concept of time-reversal symmetry [4]. We achieve probabilities of 66 % for generating a single, arbitrarily-shaped photon into the cavity mode upon a trigger signal. Furthermore, the system serves as a memory for short coherent pulses beyond the adiabatic limit. As a second source of single-photon emission, strain-tunable semiconductor quantum dots (QDs) are presented. Their emission is fixed to the D1 line of rubidium by realizing a rate-based frequency-stabilization to an atomic reference. The indistinguishability of photons from two separate, stabilized QDs is verified in a Hong-Ou-Mandel experiment.
[1] PRB 98, 161302 (2018). [2] PRL 121, 173603 (2018). [3] PRA 85, 023834 (2012). [4] PRA 76, 033804 (2007).