Ultrastrong coupling between electron tunneling and mechanical motion

Abstract

The ultrastrong coupling of single-electron tunneling and nanomechanical motion opens exciting opportunities to explore fundamental questions and develop new platforms for quantum technologies. We have measured and modeled this electromechanical coupling in a fully-suspended carbon nanotube device and report a ratio of $g_{\mathrm{m}}/{\omega }_{\mathrm{m}}=2.72\pm 0.14$, where $g_{\mathrm{m}}/2\pi =0.80\pm 0.04$ GHz is the coupling strength and ${\omega }_{\mathrm{m}}/2\pi =294.5$ MHz is the mechanical resonance frequency. This is well within the ultrastrong coupling regime and the highest among all other electromechanical platforms. We show that, although this regime was present in similar fully-suspended carbon nanotube devices, it went unnoticed. Even higher ratios could be achieved with improvement on device design.

13 pages, 11 figures This new version contains the same model and analysis but applied to new experimental data compared to the previous version. This is why the coupling ratio is now 2.72 instead of 1.3 and most of the experimental parameters have changed

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• Stability of long-sustained oscillations induced by electron tunneling
• Cooper quartets in interacting hybrid superconducting systems
• Steady-state Peierls transition in nanotube quantum simulator
• Thermodynamic and energetic constraints on transition probabilities of small-scale quantum systems
• Extra cost of erasure due to quantum lifetime broadening
• Lindblad theory for incoherently-driven electron transport in molecular nanojunctions
• Emergent Bell Phase in an Electro-Nanomechanical Quantum Simulator