Building a scalable, universal, high-performance quantum processor is a formidable challenge. In particular, the problem of realizing fast, high-performance two-qubit gates of high fidelity has yet to be addressed. Here, we propose a building block for a scalable quantum processor consisting of two transmons and a tunable three-mode coupler allowing for $ZZ$ interaction control. We experimentally demonstrate a native cz gate with a pulse duration of 60 ns, achieving a two-qubit gate fidelity above $98\mathrm{\%}$, limited mostly by the qubit coherence time. Numerical simulations show that by optimizing the gate duration, the fidelity can be pushed over $99.97\mathrm{\%}$.

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• Open quantum systems & decoherence
• Optoelectronics
• Quantum gates
• Quantum information with solid state qubits
• Superconducting devices
• Microwave techniques