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- W3136117234 abstract "We investigate the performance of microwave-frequency phononic crystal resonators fabricated on thin-film lithium niobate for integration with superconducting quantum circuits. For different design geometries at millikelvin temperatures, we achieve mechanical internal quality factors Qi above 105–106 at high microwave drive power, corresponding to 5×106 phonons inside the resonator. By sweeping the defect size of resonators with identical mirror cell designs, we are able to indirectly observe signatures of the complete phononic bandgap via the resonators' internal quality factors. Examination of quality factors' temperature dependence shows how superconducting and two-level system (TLS) loss channels impact device performance. Finally, we observe an anomalous low-temperature frequency shift consistent with resonant TLS decay and find that the material choice can help to mitigate these losses." @default.
- W3136117234 created "2021-03-29" @default.
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- W3136117234 date "2021-03-22" @default.
- W3136117234 modified "2023-10-14" @default.
- W3136117234 title "Loss channels affecting lithium niobate phononic crystal resonators at cryogenic temperature" @default.
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- W3136117234 doi "https://doi.org/10.1063/5.0034909" @default.
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