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<p>Integrated optomechanical systems are a leading platform for manipulating, sensing, and distributing quantum information, but are limited by residual optical heating. Here, we demonstrate a two-dimensional optomechanical crystal (OMC) geometry with increased thermal anchoring and a mechanical mode at 7.4 GHz, well aligned with the operation range of cryogenic microwave hardware and piezoelectric transducers. The eight times better thermalization than current one-dimensional OMCs, large optomechanical coupling rates, <i>g</i><sub>0</sub>/2<i>π</i>&#xa0; ≈ &#xa0;880 kHz, and high optical quality factors, <i>Q</i><sub>opt</sub>&#xa0;=&#xa0;2.4&#xa0;×&#xa0;10<sup>5</sup>, allow ground-state cooling (<i>n</i><sub>m</sub>&#xa0;=&#xa0;0.32) of the acoustic mode from 3 K and entering the optomechanical strong-coupling regime. In pulsed sideband asymmetry measurements, we show ground-state operation (<i>n</i><sub>m</sub>&#xa0;&lt;&#xa0;0.45) at temperatures below 10 mK, with repetition rates up to 3 MHz, generating photon-phonon pairs at &#xa0;≈&#xa0;147 kHz. Our results extend optomechanical system capabilities and establish a robust foundation for future microwave-to-optical transducers with entanglement rates exceeding state-of-the-art superconducting qubit decoherence rates.</p>

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High photon-phonon pair generation rate in a two-dimensional optomechanical crystal

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  • 发表日期：

    2025年3月15日

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  • Felix M. Mayor,
  • Sultan Malik,
  • André G. Primo,
  • Samuel Gyger,
  • Wentao Jiang,
  • Thiago P. M. Alegre,
  • Amir H. Safavi-Naeini

摘要

Integrated optomechanical systems are a leading platform for manipulating, sensing, and distributing quantum information, but are limited by residual optical heating. Here, we demonstrate a two-dimensional optomechanical crystal (OMC) geometry with increased thermal anchoring and a mechanical mode at 7.4 GHz, well aligned with the operation range of cryogenic microwave hardware and piezoelectric transducers. The eight times better thermalization than current one-dimensional OMCs, large optomechanical coupling rates, g0/2π  ≈  880 kHz, and high optical quality factors, Qopt = 2.4 × 105, allow ground-state cooling (nm = 0.32) of the acoustic mode from 3 K and entering the optomechanical strong-coupling regime. In pulsed sideband asymmetry measurements, we show ground-state operation (nm < 0.45) at temperatures below 10 mK, with repetition rates up to 3 MHz, generating photon-phonon pairs at  ≈ 147 kHz. Our results extend optomechanical system capabilities and establish a robust foundation for future microwave-to-optical transducers with entanglement rates exceeding state-of-the-art superconducting qubit decoherence rates.