Transform-limited single photons from a single quantum dot

Andreas V. Kuhlmann (), Jonathan H. Prechtel, Julien Houel, Arne Ludwig, Dirk Reuter, Andreas D. Wieck and Richard J. Warburton
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Andreas V. Kuhlmann: University of Basel
Jonathan H. Prechtel: University of Basel
Julien Houel: University of Basel
Arne Ludwig: Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum
Dirk Reuter: Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum
Andreas D. Wieck: Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum
Richard J. Warburton: University of Basel

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Developing a quantum photonics network requires a source of very-high-fidelity single photons. An outstanding challenge is to produce a transform-limited single-photon emitter to guarantee that single photons emitted far apart in the time domain are truly indistinguishable. This is particularly difficult in the solid-state as the complex environment is the source of noise over a wide bandwidth. A quantum dot is a robust, fast, bright and narrow-linewidth emitter of single photons; layer-by-layer growth and subsequent nano-fabrication allow the electronic and photonic states to be engineered. This represents a set of features not shared by any other emitter but transform-limited linewidths have been elusive. Here, we report transform-limited linewidths measured on second timescales, primarily on the neutral exciton but also on the charged exciton close to saturation. The key feature is control of the nuclear spins, which dominate the exciton dephasing via the Overhauser field.

Date: 2015
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DOI: 10.1038/ncomms9204

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