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Frontiers in Optics

Ultra-bright Source of Indistinguishable Single Photons

Alisa Javadi, Natasha Tomm, Nadia O. Antoniadis, Daniel Najer, Matthias C. Löbl, Alexander Rolf Korsch, Rüdiger Schott, Sascha R. Valentin, Andreas Dirk Wieck, Arne Ludwig, Richard John Warburton

Published Jan 1, 2020• 0 citations
Publisher

Abstract

We demonstrate an ultra-bright source of coherent single photons with an average end-to-end efficiency of 55%. By the virtue of our record efficiency, a 20-photon quantum protocol will run seven orders of magnitude faster than the state-of-the-art.
DOI
10.1364/fio.2020.jtu7b.1

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Long-range, terrestrial quantum networks require high-brightness single-photon sources emitting in the telecom C-band for maximum transmission rates. For solid-state quantum emitters, the underlying pumping process, i.e., coherent or incoherent excitation schemes, impacts several photon properties such as photon indistinguishability, single-photon purity, and photon number coherence. These properties play a major role in quantum communication applications, the latter in particular for quantum cryptography. Here, we present a versatile telecom C-band single-photon source that is operated coherently and incoherently using two complementary pumping schemes. The source is based on a quantum dot coupled to a circular Bragg grating cavity, whereas coherent (incoherent) operation is performed via the novel SUPER scheme (phonon-assisted excitation). In this way, high end-to-end-efficiencies (η end ) of 5.36% (6.09%) are achieved simultaneously with a small multiphoton contribution g (2) (0) of 0.076 ± 0.001 [ g (2) (0) of 0.069 ± 0.001] for coherent (incoherent) operation.