  Quantum algorithms often benefit from the ability to execute multi-qubit (>2)
gates. To date such multi-qubit gates are typically decomposed into single- and
two-qubit gates, particularly in superconducting qubit architectures. The
ability to perform multi-qubit operations in a single step could vastly improve
the fidelity and execution time of many algorithms. Here, we propose a single
shot method for executing an i-Toffoli gate, a three-qubit gate gate with two
control and one target qubit, using currently existing superconducting
hardware. We show numerical evidence for a process fidelity over 98% and a gate
time of 500 ns for superconducting qubits interacting via tunable couplers. Our
method can straight forwardly be extended to implement gates with more than two
control qubits at similar fidelities.
