## Events at Physics |
||

<< Spring 2013 | Fall 2013 | Spring 2014 >> |

Subscribe to receive email announcements of events |

**R. G. Herb Condensed Matter Seminar**

**Robust, self-consistent, closed-form tomography of quantum logic gates on a trapped ion qubit**

**Date:**

**Thursday, October 31st**

**Time:**10:00 am

**Place:**5310 Chamberlin Hall

**Speaker:**John Gamble, Sandia National Laboratory

**Abstract:**We introduce and demonstrate experimentally: (1) a framework called "gate set tomography" (GST) for self-consistently characterizing an entire set of quantum logic gates on a black-box quantum device; (2) an explicit closed-form protocol for linear-inversion gate set tomography (LGST), whose reliability is independent of pathologies such as local maxima of the likelihood; and (3) a simple protocol for objectively scoring the accuracy of a tomographic estimate without reference to target gates, based on how well it predicts a set of testing experiments. We use gate set tomography to characterize a set of Clifford-generating gates on a single trapped-ion qubit, and compare the performance of (i) standard process tomography; (ii) linear gate set tomography; and (iii) maximum likelihood gate set tomography. arXiv:1310.4492

**Host:**Coppersmith