Related papers: Microwave Crosstalk in Planar Superconducting Quantum Devices

Microwave Crosstalk in Planar Superconducting Quantum Devices

URL: http://arxiv.org/abs/2606.02440v1
Date: Mon, 01 Jun 2026 16:12:03 GMT
Title: Microwave Crosstalk in Planar Superconducting Quantum Devices
Abstract summary: Microwave crosstalk poses a major challenge to scaling superconducting quantum devices.<n>We develop physical models that quantitatively explain the experimentally observed crosstalk.<n>Our results provide practical guidance for low-crosstalk device layouts.
Score: 1.4006286008713642
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Microwave crosstalk poses a major challenge to scaling superconducting quantum devices as it introduces excess control errors. Although its magnitude and impact have been explored in various experimental settings, quantitative physical models capable of explaining measured crosstalk for a given device geometry remain scarce. Here, we address this gap by investigating microwave crosstalk in planar superconducting devices with crossovers. We identify two structures that can lead to strong crosstalk: a drive line routed in close proximity to another qubit, and a drive line crossing a qubit-qubit coupler using an air bridge. We design and characterize devices involving these structures and develop physical models that quantitatively explain the experimentally observed crosstalk. Based on these models, we discuss the design considerations for reducing microwave crosstalk. Our results provide practical guidance for low-crosstalk device layouts and establish a basis for the systematic investigation of weaker crosstalk mechanisms.

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