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- W4381612618 abstract "In single crystals, the suppression of intrinsic loss channels at low temperatures leads to exceptionally long mechanical lifetimes. Quantum electrical control of such long-lived mechanical oscillators would enable the development of phononic memory elements, sensors and transducers. The integration of piezoelectric materials is one approach to introducing electrical control, but the challenges of combining heterogeneous materials lead to severely limited phonon lifetimes. Here we present a non-piezoelectric silicon electromechanical system capable of operating in the gigahertz frequency band. Relying on a driving scheme based on electrostatic fields and the kinetic inductance effect in disordered superconductors, we demonstrate a parametrically enhanced electromechanical coupling of g/2π = 1.1 MHz, sufficient to enter the strong-coupling regime with a cooperativity of $${{{mathcal{C}}}}={1,200}$$ . In our best devices, we measure mechanical quality factors approaching Q ≈ 107, measured at low-phonon numbers and millikelvin temperatures. Despite using strong electrostatic fields, we find the cavity mechanics system in the quantum ground state, verified by thermometry measurements. Simultaneously achieving ground-state operation, long mechanical lifetimes and strong coupling sets the stage for employing silicon electromechanical devices in hybrid quantum systems and as a tool for studying the origins of acoustic loss in the quantum regime. Electrical control of quantum mechanical oscillators is normally performed using piezoelectrics, but incorporating these additional materials can severely reduce performance. Electrostatic control has now been demonstrated in a silicon device." @default.
- W4381612618 created "2023-06-23" @default.
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- W4381612618 date "2023-06-22" @default.
- W4381612618 modified "2023-10-01" @default.
- W4381612618 title "A quantum electromechanical interface for long-lived phonons" @default.
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- W4381612618 doi "https://doi.org/10.1038/s41567-023-02080-w" @default.
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