Quantum error correction will be a necessary component towards realizingscalable quantum computers with physical qubits. Theoretically, it is possibleto perform arbitrarily long computations if the error rate is below a thresholdvalue. The two-dimensional surface code permits relatively high fault-tolerantthresholds at the ~1% level, and only requires a latticed network of qubitswith nearest-neighbor interactions. Superconducting qubits have continued tosteadily improve in coherence, gate, and readout fidelities, to become aleading candidate for implementation into larger quantum networks. Here wedescribe characterization experiments and calibration of a system of foursuperconducting qubits arranged in a planar lattice, amenable to the surfacecode. Insights into the particular qubit design and comparison betweensimulated parameters and experimentally determined parameters are given.Single- and two-qubit gate tune-up procedures are described and results forsimultaneously benchmarking pairs of two-qubit gates are given. All controlsare eventually used for an arbitrary error detection protocol described inseparate work [Corcoles et al., Nature Communications, 6, 2015]
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