Peter Lodahl

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A major challenge in quantum optics and quantum information technology is to enhance the interaction between single photons and single quantum emitters. This requires highly engineered optical cavities that are inherently sensitive to fabrication imperfections. We have demonstrated a fundamentally different approach in which disorder is used as a resource(More)
We use single self-assembled InGaAs quantum dots as internal probes to map the local density of optical states of photonic crystal membranes. The employed technique separates contributions from nonradiative recombination and spin-flip processes by properly accounting for the role of the exciton fine structure. We observe inhibition factors as high as 70 and(More)
Engineering photon emission and scattering is central to modern photonics applications ranging from light harvesting to quantum-information processing. To this end, nanophotonic waveguides are well suited as they confine photons to a one-dimensional geometry and thereby increase the light-matter interaction. In a regular waveguide, a quantum emitter(More)
Control of spontaneously emitted light lies at the heart of quantum optics. It is essential for diverse applications ranging from miniature lasers and light-emitting diodes, to single-photon sources for quantum information, and to solar energy harvesting. To explore such new quantum optics applications, a suitably tailored dielectric environment is required(More)
Complex dielectric media often appear opaque because light traveling through them is scattered multiple times. Although the light scattering is a random process, different paths through the medium can be correlated encoding information about the medium. Here, we present spectroscopic measurements of nonuniversal intensity correlations that emerge when(More)
Wave propagation in disordered media can be strongly modified by multiple scattering and wave interference. Ultimately, the so-called Andersonlocalized regime is reached when the waves become strongly confined in space. So far, Anderson localization of light has been probed in transmission experiments by measuring the intensity of an external light source(More)
P. Kaer,1,* T. R. Nielsen,1 P. Lodahl,2 A.-P. Jauho,3 and J. Mørk1 1DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Building 345, 2800 Kgs. Lyngby, Denmark 2Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark 3Center for Nanostructured Graphene (CNG), Department of Microand(More)
We present time-resolved spontaneous emission measurements of single quantum dots embedded in photonic crystal waveguides. Quantum dots that couple to a photonic crystal waveguide are found to decay up to 27 times faster than uncoupled quantum dots. From these measurements beta-factors of up to 0.89 are derived, and an unprecedented large bandwidth of 20 nm(More)
A quantum emitter efficiently coupled to a nanophotonic waveguide constitutes a promising system for the realization of single-photon transistors, quantum-logic gates based on giant single-photon nonlinearities, and high bit-rate deterministic single-photon sources. The key figure of merit for such devices is the β factor, which is the probability for an(More)
Jeppe Johansen,1,* Søren Stobbe,1 Ivan S. Nikolaev,2,3 Toke Lund-Hansen,1 Philip T. Kristensen,1 Jørn M. Hvam,1 Willem L. Vos,2,3 and Peter Lodahl1,† 1COM·DTU, Department of Communications, Optics, and Materials, Technical University of Denmark, DTU-Building 345 V, DK-2800 Kgs. Lyngby, Denmark 2Center for Nanophotonics, FOM Institute for Atomic and(More)