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Bulletin of the American Physical Society

Randomized Benchmarking of Superconducting Qubits

Jerry M. Chow, Jay Gambetta, Lars Tornberg, Jens Koch, Lev S. Bishop, Andrew Houck, S. M. Girvin, Robert J. Schoelkopf

Published Mar 20, 2009• 0 citations
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Typical quantum gate tomography protocols struggle with a self-consistency problem: the gate operation cannot be reconstructed without knowledge of the initial state and final measurement, but such knowledge cannot be obtained without well-characterized gates. A recently proposed technique, known as randomized benchmarking tomography (RBT), sidesteps this self-consistency problem by designing experiments to be insensitive to preparation and measurement imperfections. We implement this proposal in a superconducting qubit system, using a number of experimental improvements including implementing each of the elements of the Clifford group in single 'atomic' pulses and custom control hardware to enable large overhead protocols. We show a robust reconstruction of several single-qubit quantum gates, including a unitary outside the Clifford group. We demonstrate that RBT yields physical gate reconstructions that are consistent with fidelities obtained by RB.