Optomechanical coupling and damping of a carbon nanotube quantum dot

Carbon nanotubes are excellent nano-electromechanical systems, combining high resonance frequency, low mass, and large zero-point motion. At cryogenic temperatures they display high mechanical quality factors. Equally they are outstanding single electron devices with well-known quantum levels and ha...

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Bibliographic Details
Published in:arXiv.org 2023-11
Main Authors: Hüttner, N, Blien, S, Steger, P, Loh, A N, Graaf, R, Hüttel, A K
Format: Article
Language:English
Subjects:
Carbon nanotubes
Coupling
Cryogenic temperature
Damping
Nanoelectromechanical systems
Quantum dots
Qubits (quantum computing)
Single electrons
Subsystems
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Summary:Carbon nanotubes are excellent nano-electromechanical systems, combining high resonance frequency, low mass, and large zero-point motion. At cryogenic temperatures they display high mechanical quality factors. Equally they are outstanding single electron devices with well-known quantum levels and have been proposed for the implementation of charge or spin qubits. The integration of these devices into microwave optomechanical circuits is however hindered by a mismatch of scales, between typical microwave wavelengths, nanotube segment lengths, and nanotube deflections. As experimentally demonstrated recently in [Blien et al., Nat. Comm. 11, 1363 (2020)], coupling enhancement via the quantum capacitance allows to circumvent this restriction. Here we extend the discussion of this experiment. We present the subsystems of the device and their interactions in detail. An alternative approach to the optomechanical coupling is presented, allowing to estimate the mechanical zero point motion scale. Further, the mechanical damping is discussed, hinting at hitherto unknown interaction mechanisms.
ISSN:2331-8422
DOI:10.48550/arxiv.2304.02748