Complete universal quantum gate set approaching fault-tolerant thresholds with superconducting qubits

Abstract

We use quantum process tomography to characterize a full universal set of all-microwave gates on two superconducting single-frequency single-junction transmon qubits. All extracted gate fidelities, including those for Clifford group generators, single-qubit pi/4 and pi/8 rotations, and a two-qubit controlled-NOT, exceed 95% (98%), without (with) accounting for state preparation and measurement errors. Furthermore, we introduce a process map representation in the Pauli basis which is visually efficient and informative. This high-fidelity gate set serves as another critical building block towards scalable architectures of superconducting qubits for error correction schemes.

4 figures, 2 tables plus supplementary material

References in corpus (8)

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• Fault-tolerant quantum computation with high threshold in two dimensions
• Simple pulses for elimination of leakage in weakly nonlinear qubits
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Cited by in corpus (26)

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• Experimental demonstration of fault-tolerant state preparation with superconducting qubits
• Process verification of two-qubit quantum gates by randomized benchmarking
• Characterizing Quantum Microwave Radiation and its Entanglement with Superconducting Qubits using Linear Detectors
• Characterization and reduction of microfabrication-induced decoherence in superconducting quantum circuits
• Preserving entanglement and nonlocality in solid-state qubits by dynamical decoupling
• Surface code with decoherence: An analysis of three superconducting architectures
• Analysis of parametrically driven exchange-type (iSWAP) and two-photon (bSWAP) interactions between superconducting qubits
• Compressed sensing quantum process tomography for superconducting quantum gates
• Optimized Surface Code Communication in Superconducting Quantum Computers
• Gate-error analysis in simulations of quantum computers with transmon qubits
• Analytical approach to swift nonleaky entangling gates in superconducting qubits
• Interfacing microwave qubits and optical photons via spin ensembles
• A leakage-resilient approach to fault-tolerant quantum computing with superconducting elements
• Measuring a transmon qubit in circuit QED: dressed squeezed states
• Tunable-Cavity QED with Phase Qubits
• Optimal control for fast and high-fidelity quantum gates in coupled superconducting flux qubits
• Quantum Computation with Topological Codes: from qubit to topological fault-tolerance
• Dynamics of parametric fluctuations induced by quasiparticle tunneling in superconducting flux qubits
• Multi-frequency modes in superconducting resonators: Bridging frequency gaps in off-resonant couplings
• Efficient transfer of an arbitrary qutrit state in circuit QED
• Inverted Singlet-Triplet Qubit Coded on a Two-Electron Double Quantum Dot
• Generating multipartite entangled states of qubits distributed in different cavities
• Resource optimization for fault-tolerant quantum computing