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Low-loss millimeter-wave resonators with an improved coupling structure
Superconductor Science and Technology ( IF 3.6 ) Pub Date : 2024-02-08 , DOI: 10.1088/1361-6668/ad22ff A Anferov , S P Harvey , F Wan , K H Lee , J Simon , D I Schuster
Superconductor Science and Technology ( IF 3.6 ) Pub Date : 2024-02-08 , DOI: 10.1088/1361-6668/ad22ff A Anferov , S P Harvey , F Wan , K H Lee , J Simon , D I Schuster
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 105, with a two-level-system loss limit above 106, 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.
更新日期：2024-02-08
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