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arXiv · 1604.06050

Multimode Strong Coupling in Superconducting Cavity Piezo-electromechanics

Xu Han·Chang-Ling Zou·Hong X. Tang
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Abstract

High frequency mechanical resonators subjected to low thermal phonon occupancy are easier to be prepared to the ground state by direct cryogenic cooling. Their extreme stiffness, however, poses a significant challenge for external interrogations. Here we demonstrate a superconducting cavity piezo-electromechanical system in which multiple modes of a bulk acoustic resonator oscillating at $10\,\textrm{GHz}$ are coupled to a planar microwave superconducting resonator with a cooperativity exceeding $2\times10^{3}$, deep in the strong coupling regime. By implementation of the non-contact coupling scheme to reduce mechanical dissipation, the system exhibits excellent coherence characterized by a frequency-quality factor product of $7.5\times10^{15}\,\textrm{Hz}$. Interesting dynamics of temporal oscillations of the microwave energy is observed, implying the coherent conversion between phonons and photons. The demonstrated high frequency cavity piezo-electromechanics is compatible with superconducting qubits, representing an important step towards hybrid quantum systems.

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Xu Han, Chang-Ling Zou, Hong X. Tang. 2016-04-20. Multimode Strong Coupling in Superconducting Cavity Piezo-electromechanics. https://doi.org/10.1103/physrevlett.117.123603

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