Characterizing a four-qubit planar lattice for arbitrary error detection

Jerry M. Chow; Srikanth J. Srinivasan; Easwar Magesan; A. D. Córcoles; David W. Abraham; Jay M. Gambetta; Matthias Steffen

doi:10.1117/12.2192740

21 May 2015 Characterizing a four-qubit planar lattice for arbitrary error detection

Jerry M. Chow, Srikanth J. Srinivasan, Easwar Magesan, A. D. Córcoles, David W. Abraham, Jay M. Gambetta, Matthias Steffen

Author Affiliations +

Proceedings Volume 9500, Quantum Information and Computation XIII; 95001G (2015) https://doi.org/10.1117/12.2192740
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

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

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