Correlated Dephasing in a Piezoelectrically Transduced Silicon Phononic Waveguide

• URL: http://arxiv.org/abs/2502.16426v1
• Date: Sun, 23 Feb 2025 03:49:15 GMT
• Title: Correlated Dephasing in a Piezoelectrically Transduced Silicon Phononic Waveguide
• Authors: Oliver A. Hitchcock, Felix M. Mayor, Wentao Jiang, Matthew P. Maksymowych, Sultan Malik, Amir H. Safavi-Naeini,
• Abstract summary: We design, fabricate, and characterize a compact silicon single-mode phononic waveguide actuated by a thin-film lithium niobate piezoelectric element.<n>Our device directly transduces between microwave frequency photons and phonons propagating in the silicon waveguide, providing a route for coupling to superconducting circuits.
• Score: 2.7975252049432853
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Nanomechanical waveguides offer a multitude of applications in quantum and classical technologies. Here, we design, fabricate, and characterize a compact silicon single-mode phononic waveguide actuated by a thin-film lithium niobate piezoelectric element. Our device directly transduces between microwave frequency photons and phonons propagating in the silicon waveguide, providing a route for coupling to superconducting circuits. We probe the device at millikelvin temperatures through a superconducting microwave resonant matching cavity to reveal harmonics of the silicon waveguide and extract a piezoelectric coupling rate $g/2\pi= 1.1$ megahertz and a mechanical coupling rate $f/2\pi=5$ megahertz. Through time-domain measurements of the silicon mechanical modes, we observe energy relaxation timescales of $T_{1,\text{in}} \approx 500$ microseconds, pure dephasing timescales of $T_\phi \approx {60}$ microseconds and dephasing dynamics that indicate the presence of an underlying frequency noise process with a non-uniform spectral distribution. We measure phase noise cross-correlations between silicon mechanical modes and observe detuning-dependent positively-correlated frequency fluctuations. Our measurements provide valuable insights into the dynamics and decoherence characteristics of hybrid piezoelectric-silicon acoustic devices, and suggest approaches for mitigating and circumventing noise processes for emerging quantum acoustic systems.

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