Propagation velocity measurements of substrate phonon bursts using MKIDs for superconducting circuits
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909448776187904 |
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| author | Moshel, Guy Rabinowitz, Omer Blumenthal, Eliya Hacohen-Gourgy, Shay |
| author_facet | Moshel, Guy Rabinowitz, Omer Blumenthal, Eliya Hacohen-Gourgy, Shay |
| contents | High-energy bursts in superconducting quantum circuits from various radiation sources have recently become a practical concern due to induced errors and their propagation in the chip. The speed and distance of these disturbances have practical implications. We used a linear array of multiplexed MKIDs on a single silicon chip to measure the propagation velocity of a localized high-energy burst, introduced by driving a Normal metal- Insulator-Superconductor (NIS) junction. We observed a reduction in the apparent propagation velocity with NIS power, which is due to the combined effect of reduced phonon flux with distance and the existence of a minimum detectable QP density in the MKIDs. A simple theoretical model is fitted to extract the longitudinal phonon velocity in the substrate and the conversion efficiency of phonons to QPs in the superconductor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_03011 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Propagation velocity measurements of substrate phonon bursts using MKIDs for superconducting circuits Moshel, Guy Rabinowitz, Omer Blumenthal, Eliya Hacohen-Gourgy, Shay Superconductivity High-energy bursts in superconducting quantum circuits from various radiation sources have recently become a practical concern due to induced errors and their propagation in the chip. The speed and distance of these disturbances have practical implications. We used a linear array of multiplexed MKIDs on a single silicon chip to measure the propagation velocity of a localized high-energy burst, introduced by driving a Normal metal- Insulator-Superconductor (NIS) junction. We observed a reduction in the apparent propagation velocity with NIS power, which is due to the combined effect of reduced phonon flux with distance and the existence of a minimum detectable QP density in the MKIDs. A simple theoretical model is fitted to extract the longitudinal phonon velocity in the substrate and the conversion efficiency of phonons to QPs in the superconductor. |
| title | Propagation velocity measurements of substrate phonon bursts using MKIDs for superconducting circuits |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2501.03011 |