Demonstration of robust quantum gate tomography via randomized benchmarking
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Johnson-2015-Demonstration of rob.pdf
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Author(s)
Kimmel, Shelby
Johnson, Blake R.
da Silva, Marcus P.
Ryan, Colm A.
Chow, Jerry M.
Ohki, Thomas A.
Date Issued
November 2015
Journal
New Journal of Physics
Publisher
IOP Publishing
Citation
Johnson, Blake R, Marcus P da Silva, Colm A Ryan, Shelby Kimmel, Jerry M Chow, and Thomas A Ohki. “Demonstration of Robust Quantum Gate Tomography via Randomized Benchmarking.” New J. Phys. 17, no. 11 (November 6, 2015): 113019. © 2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
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Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1088/1367-2630/17/11/113019
