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

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

arXiv · 2311.05353

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

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

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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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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. 2023-11-09. A quantum dot coupled to a suspended-beam mechanical resonator: from the unresolved- to the resolved-sideband regime. https://arxiv.org/abs/2311.05353

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