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Showing 1–10 of 10 results
Advanced filters: Author: Matthias C. Löbl Clear advanced filters

  • Resonantly-excited quantum-dot-based single photon sources feature very high purity, but also limited efficiency due to the need to suppress the residual pump. Here, the authors demonstrate a workaround, performing optical pumping and signal collection in two orthogonal modes inside a nanophotonic circuit.

    • Ravitej Uppu
    • Hans T. Eriksen
    • Leonardo Midolo
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-6

  • Radiative Auger is a process that leads to a red-shift of the optical emission of an atom or a charged solid-state quantum emitter. Here, the authors realize the inverse process by optically driving the radiative Auger transition of a short-lived electronic state in a semiconductor quantum dot.

    • Clemens Spinnler
    • Liang Zhai
    • Matthias C. Löbl
    ResearchOpen Access
    Nature Communications
    Volume: 12, P: 1-6

  • High efficiency, coherence and indistinguishability are key requirements for the application of single-photon sources for quantum technologies, but hard to achieve concurrently. A gated quantum dot in an open, tunable microcavity now can create single photons on-demand with an end-to-end efficiency of 57%, preserving coherence over microsecond-long trains of single photons.

    • Natasha Tomm
    • Alisa Javadi
    • Richard John Warburton
    Research
    Nature Nanotechnology
    Volume: 16, P: 399-403

  • In a radiative Auger process, an excited electron relaxes by concomitant emission of a redshifted photon and energy transfer to another electron. Measuring radiative Auger processes in a quantum dot with single-photon resolution enables determination of the energy of single-electron levels as well as their lifetimes.

    • Matthias C. Löbl
    • Clemens Spinnler
    • Richard J. Warburton
    Research
    Nature Nanotechnology
    Volume: 15, P: 558-562

  • GaAs quantum dots emitting at the near-red part of the spectrum usually suffers from excess charge-noise. With a careful design of a n-i-p-diode structure hosting GaAs quantum dots, the authors demonstrate ultralow-noise behaviour and high-fidelity spin initialisation close to rubidium wavelengths.

    • Liang Zhai
    • Matthias C. Löbl
    • Richard J. Warburton
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-8

  • Strong coupling between a gated semiconductor quantum dot and an optical microcavity is observed in an ultralow-loss frequency-tunable microcavity device.

    • Daniel Najer
    • Immo Söllner
    • Richard J. Warburton
    Research
    Nature
    Volume: 575, P: 622-627

  • Droplet GaAs quantum dots are interconnectable sources of single photons. Near-identical photons from remote GaAs quantum dots now show an interference visibility of 93% with quantum entanglement between the separate photon streams from the two sources.

    • Liang Zhai
    • Giang N. Nguyen
    • Richard J. Warburton
    Research
    Nature Nanotechnology
    Volume: 17, P: 829-833

  • The application of quantum dots for quantum communication is limited by the wetting layer, which is inherent to the Stranski–Krastanov growth method. Here, the authors advance this method by decoupling the quantum dot and wetting layer states, which modifies their excitonic properties.

    • Matthias C. Löbl
    • Sven Scholz
    • Richard J. Warburton
    ResearchOpen Access
    Communications Physics
    Volume: 2, P: 1-7