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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.14660 |
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| _version_ | 1866910776587976704 |
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| author | Emser, Alec L. Metzger, Cyril Rose, Brendon C. Lehnert, Konrad W. |
| author_facet | Emser, Alec L. Metzger, Cyril Rose, Brendon C. Lehnert, Konrad W. |
| contents | Piezoelectric phononic crystal resonators (PCRs) are a promising platform for acoustic quantum processing, yet their performance is currently limited by coupling to an ensemble of saturable two-level system (TLS) defects within the resonator material. Motivated by its excellent bulk mechanical properties and high crystallinity, we address this by fabricating PCRs from a new substrate: thin-film quartz. At single-phonon powers and millikelvin temperatures -- requisite conditions for quantum phononic processing -- we demonstrate large internal mechanical quality factors, $Q_i > 160,000$. This represents an order of magnitude improvement in single-phonon lifetimes for piezoelectric PCR. We characterize the loss channels in these devices and find that, although improved, the low-power response is still limited by coupling to a TLS bath and that a significant portion of the TLSs are associated with the aluminum coupling electrodes. To explore the high-power response we perform ringdown measurements and demonstrate high-power quality factor-frequency products $Q_i \cdot f = 1.4 \times 10^{16}$ Hz. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_14660 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Thin-film quartz for high-coherence piezoelectric phononic crystal resonators Emser, Alec L. Metzger, Cyril Rose, Brendon C. Lehnert, Konrad W. Quantum Physics Piezoelectric phononic crystal resonators (PCRs) are a promising platform for acoustic quantum processing, yet their performance is currently limited by coupling to an ensemble of saturable two-level system (TLS) defects within the resonator material. Motivated by its excellent bulk mechanical properties and high crystallinity, we address this by fabricating PCRs from a new substrate: thin-film quartz. At single-phonon powers and millikelvin temperatures -- requisite conditions for quantum phononic processing -- we demonstrate large internal mechanical quality factors, $Q_i > 160,000$. This represents an order of magnitude improvement in single-phonon lifetimes for piezoelectric PCR. We characterize the loss channels in these devices and find that, although improved, the low-power response is still limited by coupling to a TLS bath and that a significant portion of the TLSs are associated with the aluminum coupling electrodes. To explore the high-power response we perform ringdown measurements and demonstrate high-power quality factor-frequency products $Q_i \cdot f = 1.4 \times 10^{16}$ Hz. |
| title | Thin-film quartz for high-coherence piezoelectric phononic crystal resonators |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2406.14660 |