Tunable nonlinear electromechanics at the zero-point motion scale

• URL: http://arxiv.org/abs/2607.21764v1
• Date: Thu, 23 Jul 2026 19:27:33 GMT
• Title: Tunable nonlinear electromechanics at the zero-point motion scale
• Abstract summary: We demonstrate ultrastrong coupling between a nanotube mechanical oscillator and a double-quantum-dot electronic two-level system.<n>In the dispersive regime, this large coupling yields a mechanical anharmonicity of $= 1.4%$ - three orders of magnitude larger than in previous work.<n>We also demonstrate a purely quadratic cavity-based continuous readout of the mechanical motion.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Nonlinearity at the scale of zero-point motion opens new possibilities for the control and readout of nanomechanical systems, but achieving this remains a formidable challenge. Here we demonstrate that ultrastrong coupling (USC) between a nanotube mechanical oscillator and a double-quantum-dot electronic two-level system enables a mechanical Kerr (Duffing) nonlinearity at the zero-point motion scale. In the dispersive regime, this large coupling yields a mechanical anharmonicity of $α= 1.4\%$ - three orders of magnitude larger than in previous work - while preserving the predominantly mechanical nature of the lowest energy states. We further demonstrate a purely quadratic cavity-based continuous readout of the mechanical motion. This continuous nonlinear optomechanical readout is enforced by a double-quantum dot symmetry, which can be broken by gate tuning to introduce a large linear transduction. These results establish a tunable USC platform that enables strong mechanical anharmonicity and nonlinear continuous readout at the zero-point motion scale.

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