Single Shot i-Toffoli Gate in Dispersively Coupled Superconducting Qubits

Abstract

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.

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• Direct Implementation of High-Fidelity Three-Qubit Gates for Superconducting Processor with Tunable Couplers
• Machine-learning-inspired quantum optimal control of nonadiabatic geometric quantum computation via reverse engineering
• Parity-dependent state transfer for direct entanglement generation
• Lattice Hamiltonians and Stray Interactions Within Quantum Processors
• Numerical analysis of effective models for flux-tunable transmon systems
• On the fragility of gate-error metrics in simulation models of flux-tunable transmon quantum computers
• Microwave-activated high-fidelity three-qubit gate scheme for fixed-frequency superconducting qubits
• Engineering long-range and multi-body interactions via global kinetic constraints