A quantum dot coupled to a suspended-beam mechanical resonator: from the unresolved- to the resolved-sideband regime

• URL: http://arxiv.org/abs/2311.05353v1
• Date: Thu, 9 Nov 2023 13:28:52 GMT
• Title: A quantum dot coupled to a suspended-beam mechanical resonator: from the unresolved- to the resolved-sideband regime
• Authors: Clemens Spinnler, Giang N. Nguyen, Ying Wang, Marcel Erbe, Alisa Javadi, Liang Zhai, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Peter Lodahl, Leonardo Midolo, Richard J. Warburton
• Abstract summary: We present experiments in which self-assembled InAs quantum dots are coupled to a thin, suspended-beam GaAs resonator. The quantum dots are driven resonantly and the resonance fluorescence is detected. We show that one quantum dot couples to eight mechanical modes spanning a frequency range from $30$ to $600mathrmMHz$: one quantum dot provides an extensive characterisation of the mechanical resonator.
• Score: 2.116339958735258
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We present experiments in which self-assembled InAs quantum dots are coupled to a thin, suspended-beam GaAs resonator. The quantum dots are driven resonantly and the resonance fluorescence is detected. The narrow quantum-dot linewidths, just a factor of three larger than the transform limit, result in a high sensitivity to the mechanical motion. We show that one quantum dot couples to eight mechanical modes spanning a frequency range from $30$ to $600~\mathrm{MHz}$: one quantum dot provides an extensive characterisation of the mechanical resonator. The coupling spans the unresolved-sideband to the resolved-sideband regimes. Finally, we present the first detection of thermally-driven phonon sidebands (at $4.2~\mathrm{K}$) in the resonance-fluoresence spectrum.

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