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Daniel Wigger
(University of Munster et Technical University of Wroclaw)

Jeudi 7 octobre 2021 à 9h30

Zoom link: https://smartvisio2.neel.cnrs.fr/b/flo-ivm-y7c


Title: « Controlling the properties of photons by acoustic modulation of quantum dots »

Abstract: The vision of hybrid quantum technologies is to combine different systems into a single infrastructure. The goal is to overcome individual shortcomings by linking dissimilar strengths. In this context phonons can take a crucial role. They couple to almost any other excitation in the solid state, which makes them an ideal platform for on-chip inter-system communication [1]. At the same time, compared to photons, they have a much shorter wavelength at similar frequencies, promoting easy guidability in micrometer sized infrastructures.

In my talk I will report on our recent combined theoretical and experimental work to use phonons in the form of traveling surface acoustic waves (SAWs) to dynamically control the optical properties of a single semiconductor quantum dot. Performing resonance fluorescence experiments we are able to resolve the SAW induced phonon sidebands in the frequency range of about 1GHz. Operating in the single photon limit we have demonstrated how optomechanical wave mixing can be used to tailor the light scattering spectrum [2]. We have further shown that the SAW modulation introduces temporal intensity oscillations to the sidebands [3]. Overall, we have developed a comprehensive toolbox to control the frequency and the emission time of single photons.

[1] D. Wigger, K. Gawarecki and P. Machnikowski, Adv. Quantum Technol. 4, 2000128 (2021)
[2] M. Weiß, D. Wigger et al., Optica 8, 291-300 (2021)
[3] D. Wigger, M. Weiß et al., Phys. Rev. Research 3, 033197 (2021)