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Conference on Lasers and Electro-Optics

Simultaneous filtering of the Mollow triplet sidebands via a Cs-based Faraday filter

Simone Luca Portalupi, Matthias Widmann, Cornelius Nawrath, Michael Jetter, Peter Michler, Jörg Wrachtrup, Ilja Gerhardt

Published Jan 1, 2017• 0 citations
Publisher

Abstract

A Faraday filter is used to simultaneously allow the transmission of the Mollow triplet sidebands which are resonant with the Cs-D1 clock transition. The Mollow triplet is generated from a resonantly-excited quantum dot.
DOI
10.1364/cleo_at.2017.jtu5a.18

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Hybrid quantum systems are based on the capability to interface elements from complementary fields: only the best properties from all components are utilized, overcoming the limitation of each field. Semiconductor quantum dots (QDs) are well established as sources of bright, pure and highly indistinguishable on-demand single photons. A crucial limitation is given by the relatively short coherence time. This can be overtaken by interfacing them to alkali atoms, which display a very long coherence time and will benefit from the superior properties of QD-based non-classical light sources. As one example of an efficient QD-to-atom interface, we recently demonstrated the filtering of two consecutive single photons generated from a resonantly excited QD by using a Cs-based Faraday anomalous dispersion optical filter (FADOF). The Mollow triplet sidebands were tuned on resonance with the Cs-D1transition and simultaneously filtered with more than 10 % transmission. All other spectral components were suppressed below the noise level. In the present study, a Cs vapor was used to realize a variable optical delay. A resonantly excited QD is used as a source of on-demand single photons, frequency tuned in between the aforementioned Cs-D1 transition. An extensive study on the effects of vapor temperature on the achievable delay has been conducted using single photons with several different linewidth. A record delay of 28 ns was achieved for almost 100% of the transmitted photons. Autocorrelation measurements revealed that an almost ideal g(2)(0) ≈ 0 is preserved after the interaction with the atomic vapor.
Applying high-power continuous-wave resonant sss-shell excitation to a single self-assembled InGaAs quantum dot, we demonstrate the generation of postselected single-indistinguishable photons from the Mollow triplet sidebands. A sophisticated spatial filtering technique based on a double Michelson interferometer enabled us to separate the spectrally close lying individual Mollow components and perform almost background-free two-photon interference measurements. Showing high consistency with the results of an independent determination of the emission coherence of $\ensuremath{\sim}$$250\ifmmode\pm\else\textpm\fi{}30$ ps, our analysis reveals a close to ideal visibility contrast of up to 9797%97. Due to their easy spectral tunability and their distinct advantage of cascaded-photon emission between the individual Mollow sidebands, they resemble a versatile tool for quantum information applications.