title: On-chip time resolved detection of quantum dot emission using integrated superconducting single photon detectors.
abstract: We report the routing of quantum light emitted by self-assembled InGaAs quantum dots (QDs) into the optical modes of a GaAs ridge waveguide and its efficient detection on-chip via evanescent coupling to NbN superconducting nanowire single photon detectors (SSPDs). The waveguide coupled SSPDs primarily detect QD luminescence, with scattered photons from the excitation laser onto the proximal detector being negligible by comparison. The SSPD detection efficiency from the evanescently coupled waveguide modes is shown to be two orders of magnitude larger when compared with operation under normal incidence illumination, due to the much longer optical interaction length. Furthermore, in-situ time resolved measurements performed using the integrated detector show an average QD spontaneous emission lifetime of 0.95 ns, measured with a timing jitter of only 72 ps. The performance metrics of the SSPD integrated directly onto GaAs nano-photonic hardware confirms the strong potential for on-chip few-photon quantum optics using such semiconductor-superconductor hybrid systems.
authors.affiliation: Walter Schottky Institut, Physik Department and Center of Nanotechnology and Nanomaterials, Technische Universität München, 85748 Garching, Germany. guenther.reithmaier@wsi.tum.de
authors.forename: G
authors.initials: G
authors.lastname: Reithmaier
authors.forename: S
authors.initials: S
authors.lastname: Lichtmannecker
authors.forename: T
authors.initials: T
authors.lastname: Reichert
authors.forename: P
authors.initials: P
authors.lastname: Hasch
authors.forename: K
authors.initials: K
authors.lastname: Müller
authors.forename: M
authors.initials: M
authors.lastname: Bichler
authors.forename: R
authors.initials: R
authors.lastname: Gross
authors.forename: J J
authors.initials: JJ
authors.lastname: Finley
mesh_terms: D004867:Equipment Design; D053770:Nanowires / Q000737:chemistry*; D009556:Niobium / Q000737:chemistry*; D055095:Optics and Photonics; D017785:Photons; D045663:Quantum Dots; D012666:Semiconductors
chemical_list: D009556:Niobium