Quantum error correction will be a necessary component towards realizing scalable quantum computers with physical qubits. Theoretically, it is possible to perform arbitrarily long computations if the error rate is below a threshold value. The two-dimensional surface code permits relatively high fault-tolerant thresholds at the ~1% level, and only requires a latticed network of qubits with nearest-neighbor interactions. Superconducting qubits have continued to steadily improve in coherence, gate, and readout fidelities, to become a leading candidate for implementation into larger quantum networks. Here we describe characterization experiments and calibration of a system of four superconducting qubits arranged in a planar lattice, amenable to the surface code. Insights into the particular qubit design and comparison between simulated parameters and experimentally determined parameters are given. Single- and two-qubit gate tune-up procedures are described and results for simultaneously benchmarking pairs of two-qubit gates are given. All controls are eventually used for an arbitrary error detection protocol described in separate work [Corcoles et al., Nature Communications, 6, 2015].
Conference Committee Involvement (7)
Quantum Information Science, Sensing, and Computation XVI
22 April 2024 | National Harbor, Maryland, United States
Quantum Information Science, Sensing, and Computation XV
3 May 2023 | Orlando, Florida, United States
Quantum Information Science, Sensing, and Computation XIV
6 April 2022 | Orlando, Florida, United States
Quantum Information Science, Sensing, and Computation XIII
12 April 2021 | Online Only, Florida, United States
Quantum Information Science, Sensing, and Computation XII
27 April 2020 | Online Only, California, United States
Quantum Information Science, Sensing, and Computation XI
18 April 2019 | Baltimore, MD, United States
Quantum Information Science, Sensing, and Computation X
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