Native multiqubit gates could be essential for bridging the gap from current noisy devices to future utility-scale quantum computers, as they can substantially reduce circuit depth for near-term applications on noisy devices and may also lower the physical overhead of fault-tolerant quantum computation. Here we introduce a scalable protocol for implementing native multicontrolled gates on fluxonium qubits, supporting an arbitrary number of control qubits ($N>1$) while remaining compatible with existing single- and two-qubit gate realizations. Our approach leverages engineered interactions in noncomputational state manifolds to enable qubit-state selective transitions, which is activated for the direct implementation of $\left(C^{\otimes N}\right)Z$ gates. We show that in square lattices with fluxonium qubits, $CCZ, CCCZ$, and $CCCCZ$ gates with errors around 0.01 (0.001) are achievable, with gate lengths of $50\left(100\right)\text{ns}, 100\left(250\right)\text{ns}$, and $150\left(300\right)\text{ns}$, respectively. Looking forward, integrating these native multicontrolled gates with primitive single- and two-qubit gate sets within a single quantum processor could significantly enhance flexibility in circuit synthesis and offer a promising alternative pathway toward utility-scale quantum computing.

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• Quantum gates
• Quantum information architectures & platforms
• Superconducting qubits