Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 59: Transport: Poster

TT 59.6: Poster

Wednesday, March 20, 2024, 15:00–18:00, Poster E

Suspended carbon nanotube – superconducting coplanar resonator hybrid systems — •Akong N. Loh, Furkan Özyigit, Fabian Stadler, Nicole Kellner, Niklas Hüttner, and Andreas K. Hüttel — Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany

The combination of carbon nanotubes (providing quantum dots and beam-like nano-electromechanical systems) and superconducting coplanar electronics (providing GHz cavities, fast read-out, and potentially even qubits) enables a multitude of interesting low-temperature experiments. We have recently shown optomechanically induced transparency in such a combined system [1,2], where the nonlinearity of Coulomb blockade leads to an enhancement of the single photon coupling up to g₀ ≃ 95 Hz. The carbon nanotubes are grown separately and deposited into the prefabricated resonator geometries [3], leading to flexibility and increased fabrication yield. Our current work is directed towards achieving strong optomechanical coupling, and towards time-domain control of the combined hybrid system, with ongoing improvements of the microwave cavity [4], CNT growth and transfer.

[1] S. Blien et al., Nat. Comm. 11, 1636 (2020)

[2] N. Hüttner et al., PR Applied, in press (2023), arXiv:2304.02748

[3] S. Blien et al., PSS(B) 255, 1800118 (2018)

[4] N. Kellner et al., PSS(B) 2300187 (2023)

Keywords: Optomechanics; Carbon nanotubes; Quantum dot; Mechanical resonator; Microwave cavity