Low-loss Millimeter-wave Resonators with an Improved Coupling Structure

• URL: http://arxiv.org/abs/2311.01670v3
• Date: Wed, 21 Feb 2024 21:05:01 GMT
• Title: Low-loss Millimeter-wave Resonators with an Improved Coupling Structure
• Authors: Alexander Anferov, Shannon P. Harvey, Fanghui Wan, Kan-Heng Lee, Jonathan Simon and David I. Schuster
• Abstract summary: Millimeter-wave superconducting resonators are a useful tool for studying quantum device coherence in a new frequency domain. 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. Having decoupled the resonators from radiative losses, we consistently achieve single-photon quality factors above $105$, with a two-level-system loss limit above $106$.
• Score: 39.76747788992184
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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