Correlated Dephasing in a Piezoelectrically Transduced Silicon Phononic Waveguide
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910841056526336 |
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| author | Hitchcock, Oliver A. Mayor, Felix M. Jiang, Wentao Maksymowych, Matthew P. Malik, Sultan Safavi-Naeini, Amir H. |
| author_facet | Hitchcock, Oliver A. Mayor, Felix M. Jiang, Wentao Maksymowych, Matthew P. Malik, Sultan Safavi-Naeini, Amir H. |
| contents | 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 $g/2π= 1.1$ megahertz and a mechanical coupling rate $f/2π=5$ 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 $T_ϕ\approx {60}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_16426 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Correlated Dephasing in a Piezoelectrically Transduced Silicon Phononic Waveguide Hitchcock, Oliver A. Mayor, Felix M. Jiang, Wentao Maksymowych, Matthew P. Malik, Sultan Safavi-Naeini, Amir H. Mesoscale and Nanoscale Physics Quantum Physics 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 $g/2π= 1.1$ megahertz and a mechanical coupling rate $f/2π=5$ 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 $T_ϕ\approx {60}$ 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. |
| title | Correlated Dephasing in a Piezoelectrically Transduced Silicon Phononic Waveguide |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2502.16426 |