As quantum computing technology becomes increasingly sophisticated, the techniques required to calibrate and certify device performance are becoming commensurately sophisticated. In this talk, I will discuss the need for QCVV (quantum characterization, verification, and validation) protocols to facilitate advances towards fault-tolerant universal quantum computation. In particular, I'll examine what kind of errors we expect nascent quantum information processors to suffer from, and how the QCVV tools may be used for detecting, diagnosing, and ultimately correcting such errors. To illustrate this point, I will examine the role gate set tomography (GST) played in characterizing quantum operations on a trapped-Yb-ion qubit, and how GST was iteratively used to a) make the qubit gate behavior Markovian and b) verify that the errors on the qubit operations were below the threshold for fault-tolerance. Lastly, several "GST-adjacent" QCVV protocols, such as drift- and cross-talk detection will be examined, and the future of QCVV research will be discussed.
This work was supported by the Intelligence Advanced Research Projects Activity (IARPA), and Sandia's Laboratory Directed Research and Development (LDRD) Program. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-NA- 0003525.