Exceeding the Parametric Drive Strength Threshold in Nonlinear Circuits

• URL: http://arxiv.org/abs/2506.03456v1
• Date: Tue, 03 Jun 2025 23:39:10 GMT
• Title: Exceeding the Parametric Drive Strength Threshold in Nonlinear Circuits
• Authors: Mingkang Xia, Cristóbal Lledó, Matthew Capocci, Jacob Repicky, Benjamin D'Anjou, Ian Mondragon-Shem, Ryan Kaufman, Jens Koch, Alexandre Blais, Michael Hatridge,
• Abstract summary: Superconducting quantum circuits rely on strong drives to implement fast gates, high-fidelity readout, and state stabilization.<n>We show that a nonlinear coupler undergoes ionization under strong parametric driving, leading to a breakdown of coherent control.<n>This insight establishes fundamental constraints on parametric control and offers design principles for mitigating drive-induced decoherence in next-generation quantum processors.
• Score: 33.16766650698962
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Superconducting quantum circuits rely on strong drives to implement fast gates, high-fidelity readout, and state stabilization. However, these drives can induce uncontrolled excitations, so-called "ionization", that compromise the fidelity of these operations. While now well-characterized in the context of qubit readout, it remains unclear how general this limitation is across the more general setting of parametric control. Here, we demonstrate that a nonlinear coupler, exemplified by a transmon, undergoes ionization under strong parametric driving, leading to a breakdown of coherent control and thereby limiting the accessible gate speeds. Through experiments and numerical simulations, we associate this behavior with the emergence of drive-induced chaotic dynamics, which we characterize quantitatively using the instantaneous Floquet spectrum. Our results reveal that the Floquet spectrum provides a unifying framework for understanding strong-drive limitations across a wide range of operations on superconducting quantum circuits. This insight establishes fundamental constraints on parametric control and offers design principles for mitigating drive-induced decoherence in next-generation quantum processors.

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