Near Transform-Limited Quantum Dot Linewidths in a Broadband Photonic Crystal Waveguide

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Planar nanophotonic structures enable broadband, near-unity coupling of emission from quantum dots embedded within, thereby realizing ideal single-photon sources. The efficiency and coherence of the single-photon source is limited by charge noise, which results in the broadening of the emission spectrum. We report suppression of the noise by fabricating photonic crystal waveguides in a gallium arsenide membrane containing quantum dots embedded in a p-i-n diode. Local electrical contacts in the vicinity of the waveguides minimize the leakage current and allow fast electrical control (approximate to 4 MHz bandwidth) of the quantum dot resonances. Resonant linewidth measurements of 51 quantum dots coupled to the photonic crystal waveguides exhibit near transform-limited emission over a 6 nm wide range of emission wavelengths. Importantly, the local electrical contacts allow independent tuning of multiple quantum dots on the same chip, which together with the transform-limited emission are key components in realizing multiemitter-based quantum information processing.

Original languageEnglish
JournalACS Photonics
Issue number9
Pages (from-to)2343-2349
Number of pages7
Publication statusPublished - 16 Sep 2020

    Research areas

  • photonic crystal waveguide, quantum dot, single photons, resonant spectroscopy, nanophotonics, semiconductor heterostructure, EMISSION

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