Nanowire single-photon sources: mechanics matters

Alberto Artioli, Saptarshi Kotal, Niels Gregersen, Pierre Verlot, Jean-Michel Gérard, Julien Claudon

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Abstract

Tapered nanowire antennas have emerged as a versatile solid-state platform for quantum optics. These broadband photonic structures efficiently funnel the spontaneous emission of an embedded quantum dot into a directive free-space beam. They find application in the realization of bright sources of quantum light, and enable the implementation of giant optical non-linearities, at the single-photon level. In this work, we discuss advances aiming at further optimizing this light-matter interface. In particular, recent measurements revealed that the thermal excitation of a single nanowire vibration mode can have a sizeable influence on the quantum dot optical linewidth. This motivated a comprehensive theoretical analysis, which shows that the thermally-driven vibrations of the nanowire have a major impact on the quantum dot light emission spectrum. Even at liquid helium temperatures, these prevent the emission of indistinguishable photons. To overcome this intrinsic limitation, we propose several designs that restore photon indistinguishability thanks to a specific engineering of the mechanical properties of the nanowire. We anticipate that such a mechanical optimization will also play a key role in the development of other high-performance light-matter interfaces based on nanostructures.
Original languageEnglish
Publication date2020
Number of pages2
DOIs
Publication statusPublished - 2020
EventSPIE Photonics Europe 2020: Nanophotonics VIII - Online Only, France
Duration: 6 Apr 202010 Apr 2020
https://www.spiedigitallibrary.org/conference-proceedings-of-SPIE/11345.toc

Conference

ConferenceSPIE Photonics Europe 2020
LocationOnline Only
CountryFrance
Period06/04/202010/04/2020
OtherOnline event
Internet address

Keywords

  • Single photon source
  • Indistinguishable photons
  • Mechanical optimisation
  • Quantum dot
  • Nanowire atenna
  • Thermally-driven vibrations
  • Quantum dot-phonon interaction

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