On-chip deterministic operation of quantum dots in dual-mode waveguides for a plug-and-play single-photon source

Ravitej Uppu (), Hans T. Eriksen, Henri Thyrrestrup, Aslı D. Uğurlu, Ying Wang, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Matthias C. Löbl, Richard J. Warburton, Peter Lodahl and Leonardo Midolo ()
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Ravitej Uppu: University of Copenhagen
Hans T. Eriksen: University of Copenhagen
Henri Thyrrestrup: University of Copenhagen
Aslı D. Uğurlu: University of Copenhagen
Ying Wang: University of Copenhagen
Sven Scholz: Ruhr-Universität Bochum
Andreas D. Wieck: Ruhr-Universität Bochum
Arne Ludwig: Ruhr-Universität Bochum
Matthias C. Löbl: University of Basel
Richard J. Warburton: University of Basel
Peter Lodahl: University of Copenhagen
Leonardo Midolo: University of Copenhagen

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract A deterministic source of coherent single photons is an enabling device for quantum information processing. Quantum dots in nanophotonic structures have been employed as excellent sources of single photons with the promise of scaling up towards multiple photons and emitters. It remains a challenge to implement deterministic resonant optical excitation of the quantum dot required for generating coherent single photons, since residual light from the excitation laser should be suppressed without compromising source efficiency and scalability. Here, we present a planar nanophotonic circuit that enables deterministic pulsed resonant excitation of quantum dots using two orthogonal waveguide modes for separating the laser and the emitted photons. We report a coherent and stable single-photon source that simultaneously achieves high-purity (g(2)(0) = 0.020 ± 0.005), high-indistinguishability (V = 96 ± 2%), and >80% coupling efficiency into the waveguide. Such ‘plug-and-play’ single-photon source can be integrated with on-chip optical networks implementing photonic quantum processors.

Date: 2020
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DOI: 10.1038/s41467-020-17603-9

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