1202.5344 (Jerry M. Chow et al.)

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

Jerry M. Chow, Jay M. Gambetta, A. D. Corcoles, Seth T. Merkel, John A. Smolin, Chad Rigetti, S. Poletto, George A. Keefe, Mary B. Rothwell, J. R. Rozen, Mark B. Ketchen, M. Steffen

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.

View original: http://arxiv.org/abs/1202.5344