title: Simultaneous Faraday filtering of the Mollow triplet sidebands with the Cs-D1clock transition.
abstract: Hybrid quantum systems integrating semiconductor quantum dots (QDs) and atomic vapours become important building blocks for scalable quantum networks due to the complementary strengths of individual parts. QDs provide on-demand single-photon emission with near-unity indistinguishability comprising unprecedented brightness-while atomic vapour systems provide ultra-precise frequency standards and promise long coherence times for the storage of qubits. Spectral filtering is one of the key components for the successful link between QD photons and atoms. Here we present a tailored Faraday anomalous dispersion optical filter based on the caesium-D1transition for interfacing it with a resonantly pumped QD. The presented Faraday filter enables a narrow-bandwidth (Δω=2π × 1 GHz) simultaneous filtering of both Mollow triplet sidebands. This result opens the way to use QDs as sources of single as well as cascaded photons in photonic quantum networks aligned to the primary frequency standard of the caesium clock transition.
authors.affiliation: Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany.
authors.forename: Simone Luca
authors.initials: SL
authors.lastname: Portalupi
authors.affiliation: 3rd Institute of Physics, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Widmann
authors.affiliation: Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany.
authors.forename: Cornelius
authors.initials: C
authors.lastname: Nawrath
authors.affiliation: Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany.
authors.forename: Michael
authors.identifier: http://orcid.org/0000-0002-1311-6550
authors.initials: M
authors.lastname: Jetter
authors.affiliation: Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Michler
authors.affiliation: 3rd Institute of Physics, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart, Germany.|Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Wrachtrup
authors.affiliation: 3rd Institute of Physics, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart, Germany.|Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany.
authors.forename: Ilja
authors.initials: I
authors.lastname: Gerhardt