Low-loss Millimeter-wave Resonators with an Improved Coupling Structure
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916133675728896 |
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| author | Anferov, Alexander Harvey, Shannon P. Wan, Fanghui Lee, Kan-Heng Simon, Jonathan Schuster, David I. |
| author_facet | Anferov, Alexander Harvey, Shannon P. Wan, Fanghui Lee, Kan-Heng Simon, Jonathan Schuster, David I. |
| contents | Millimeter-wave superconducting resonators are a useful tool for studying quantum device coherence in a new frequency domain. However, improving resonators is difficult without a robust and reliable method for coupling millimeter-wave signals to 2D structures. We develop and characterize a tapered transition structure coupling a rectangular waveguide to a planar slotline waveguide with better than 0.5 dB efficiency over 14 GHz, and use it to measure ground-shielded resonators in the W band (75 - 110 GHz). Having decoupled the resonators from radiative losses, we consistently achieve single-photon quality factors above $10^5$, with a two-level-system loss limit above $10^6$, and verify the effectiveness of oxide removal treatments to reduce loss. These values are 4-5 times higher than those previously reported in the W band, and much closer to typical planar microwave resonators. The improved losses demonstrated by these on-chip millimeter-wave devices shed new light on quantum decoherence in a different frequency regime, offer increased selectivity for high-frequency detectors, and enables new possibilities for hybrid quantum experiments integrating millimeter-wave frequencies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_01670 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Low-loss Millimeter-wave Resonators with an Improved Coupling Structure Anferov, Alexander Harvey, Shannon P. Wan, Fanghui Lee, Kan-Heng Simon, Jonathan Schuster, David I. Quantum Physics Superconductivity Instrumentation and Detectors Millimeter-wave superconducting resonators are a useful tool for studying quantum device coherence in a new frequency domain. However, improving resonators is difficult without a robust and reliable method for coupling millimeter-wave signals to 2D structures. We develop and characterize a tapered transition structure coupling a rectangular waveguide to a planar slotline waveguide with better than 0.5 dB efficiency over 14 GHz, and use it to measure ground-shielded resonators in the W band (75 - 110 GHz). Having decoupled the resonators from radiative losses, we consistently achieve single-photon quality factors above $10^5$, with a two-level-system loss limit above $10^6$, and verify the effectiveness of oxide removal treatments to reduce loss. These values are 4-5 times higher than those previously reported in the W band, and much closer to typical planar microwave resonators. The improved losses demonstrated by these on-chip millimeter-wave devices shed new light on quantum decoherence in a different frequency regime, offer increased selectivity for high-frequency detectors, and enables new possibilities for hybrid quantum experiments integrating millimeter-wave frequencies. |
| title | Low-loss Millimeter-wave Resonators with an Improved Coupling Structure |
| topic | Quantum Physics Superconductivity Instrumentation and Detectors |
| url | https://arxiv.org/abs/2311.01670 |