Randomized benchmarking is a commonly used technique for estimating the average fidelity of quantum logic operations, measuring the decay of probability of returning to a final fiducial state as a function of the length of a sequence of randomly selected gates. Typically, repeated trials of specific pre-computed random gate sequences are used to reduce the memory requirements on control hardware, limiting the randomness of sequences. By generating pseudorandom numbers on the control hardware itself we can construct gate sequences on the fly; only the instantaneous ideal stabilizers are tracked, reducing memory requirements substantially and enabling gate sequences of arbitrary length. The just-in-time sequence generation allows each sequence to be independently random, which enforces the assumption of depolarizing error channels. Sequence lengths are chosen to extract maximum information in an allotted wall time, making the most efficient use of experiment resources.
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Presenters
Laurent Stephenson
National Institute of Standards and Tech
National Institute of Standards and Technology Boulder
National Institute of Standards and Technology, Boulder, CO 80305, USA and Department of Physics, University of Colorado, Boulder, CO 80309, USA
Authors
Laurent Stephenson
National Institute of Standards and Tech
National Institute of Standards and Technology Boulder
National Institute of Standards and Technology, Boulder, CO 80305, USA and Department of Physics, University of Colorado, Boulder, CO 80309, USA
Alex Kwiatkowski
University of Colorado, Boulder
Hannah M Knaack
University of Colorado, Boulder
National Institute of Standards and Technology, Boulder, CO 80305, USA and Department of Physics, University of Colorado, Boulder, CO 80309, USA
Alejandra L Collopy
National Institute of Standards and Tech
National Institute of Standards and Technology, Boulder, CO 80305, USA
Emanuel Knill
National Institute of Standards and Technology Boulder
Scott Glancy
National Institute of Standards and Technology Boulder
Andrew C Wilson
National Institute of Standards and Technology
National Institute of Standards and Technology Boulder
National Institute of Standards and Technology, Boulder, CO 80305, USA
Dietrich Leibfried
National Institute of Standards and Technology Boulder
National Institute of Standards and Tech
National Institute of Standards and Technology
National Institute of Standards and Technology (NIST) Boulder
National Institute of Standards and Technology, Boulder, CO 80305, USA
Daniel H Slichter
National Institute of Standards and Technology
National Institute of Standards and Technology Boulder
National Institute of Standards and Technology, Boulder, CO 80305, USA
