How the Kerr-Cat Qubit Dies-And How to Rescue It

• URL: http://arxiv.org/abs/2507.06160v1
• Date: Tue, 08 Jul 2025 16:41:03 GMT
• Title: How the Kerr-Cat Qubit Dies-And How to Rescue It
• Authors: Othmane Benhayoune-Khadraoui, Cristóbal Lledó, Alexandre Blais,
• Abstract summary: Kerr-cat qubits have been experimentally shown to exhibit a large noise bias.<n>We show that above a critical drive amplitude the tunneling time ceases to increase and even decreases.
• Score: 44.99833362998488
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Kerr-cat qubits have been experimentally shown to exhibit a large noise bias, with one decay channel suppressed by several orders of magnitude. In superconducting implementations, increasing the microwave drive on the nonlinear oscillator that hosts the Kerr-cat qubit should, in principle, further enhance this bias. Instead, experiments reveal that above a critical drive amplitude the tunneling time - the less dominant decay channel - ceases to increase and even decreases. Here, we show that this breakdown arises from the multimode nature of the circuit implementation: specifically, the buffer mode used to control the Kerr-cat qubit can induce multiphoton resonances that sharply degrade Kerr-cat coherence if its frequency is not carefully chosen. We uncover this mechanism by retaining the full circuit nonlinearities and treating the strong drive exactly within a Floquet-Markov framework that incorporates quasidegeneracies in the Kerr-cat spectrum. Our results not only provide an explanation for the sudden reduction of the tunneling time but also demonstrate the robustness of the Kerr-cat qubit when its surrounding electromagnetic environment is carefully engineered.

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