21 May 2015 Characterizing a four-qubit planar lattice for arbitrary error detection
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Abstract
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].
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Jerry M. Chow, Jerry M. Chow, Srikanth J. Srinivasan, Srikanth J. Srinivasan, Easwar Magesan, Easwar Magesan, A. D. Córcoles, A. D. Córcoles, David W. Abraham, David W. Abraham, Jay M. Gambetta, Jay M. Gambetta, Matthias Steffen, Matthias Steffen, } "Characterizing a four-qubit planar lattice for arbitrary error detection", Proc. SPIE 9500, Quantum Information and Computation XIII, 95001G (21 May 2015); doi: 10.1117/12.2192740; https://doi.org/10.1117/12.2192740
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