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.

References in corpus (16)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Charge insensitive qubit design derived from the Cooper pair box
• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Coupling Superconducting Qubits via a Cavity Bus
• Strong quantum computational advantage using a superconducting quantum processor
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• Realization of high-fidelity CZ and ZZ-free iSWAP gates with a tunable coupler
• Implementation of Conditional-Phase Gates based on tunable ZZ-Interactions
• Tunable coupler for realizing a controlled-phase gate with dynamically decoupled regime in a superconducting circuit
• High-fidelity three-qubit iToffoli gate for fixed-frequency superconducting qubits
• Fast multi-qubit gates by adiabatic evolution in interacting excited state manifolds
• Integrated tool-set for Control, Calibration and Characterization of quantum devices applied to superconducting qubits
• Single-step implementation of high fidelity $n$-bit Toffoli gate
• Floating tunable coupler for scalable quantum computing architectures
• ZZ freedom in two qubit gates
• Realization of arbitrary doubly-controlled quantum phase gates

Cited by in corpus (15)

• Measurement-free fault-tolerant quantum error correction in near-term devices
• Extensive characterization of a family of efficient three-qubit gates at the coherence limit
• Controlled-Controlled-Phase Gates for Superconducting Qubits Mediated by a Shared Tunable Coupler
• Coupler microwave-activated controlled phase gate on fluxonium qubits
• Impact of decoherence on the fidelity of quantum gates leaving the computational subspace
• An error-protected cross-resonance switch in weakly-tuneable architectures
• 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
• Quantum neural networks with multi-qubit potentials
• 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