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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 Meschede11Institut 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).

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