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.
@article{arxiv.1202.5344,
title = {Complete universal quantum gate set approaching fault-tolerant thresholds with superconducting qubits},
author = {Jerry M. Chow and Jay M. Gambetta and A. D. Corcoles and Seth T. Merkel and John A. Smolin and Chad Rigetti and S. Poletto and George A. Keefe and Mary B. Rothwell and J. R. Rozen and Mark B. Ketchen and M. Steffen},
journal= {arXiv preprint arXiv:1202.5344},
year = {2012}
}