Loss channels affecting lithium niobate phononic crystal resonators at cryogenic temperature

• URL: http://arxiv.org/abs/2010.01025v3
• Date: Sun, 28 Mar 2021 23:48:53 GMT
• Title: Loss channels affecting lithium niobate phononic crystal resonators at cryogenic temperature
• Authors: E. Alex Wollack, Agnetta Y. Cleland, Patricio Arrangoiz-Arriola, Timothy P. McKenna, Rachel G. Gruenke, Rishi N. Patel, Wentao Jiang, Christopher J. Sarabalis, Amir H. Safavi-Naeini
• Abstract summary: We investigate the performance of microwave-frequency phononic crystal resonators fabricated on thin-film lithium niobate. For different design geometries at millikelvin temperatures, we achieve mechanical internal quality factors $Q_i$ above $105 - 106$ at high microwave drive power. We observe an anomalous low-temperature frequency shift consistent with resonant TLS decay and find that material choice can help to mitigate these losses.
• Score: 1.5478632117921844
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 $Q_i$ above $10^5 - 10^6$ at high microwave drive power, corresponding to $5\times10^6$ 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 material choice can help to mitigate these losses.

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