We investigate a range of methods to perform tomography in a solid-state qubit device, for which a priori initialization and measurement of the qubit is restricted to a single basis of the Bloch sphere. We explore and compare several methods to acquire precise descriptions of additional states and measurements, quantifying both stochastic and systematic errors, ultimately leading to a tomographically-complete set that can be subsequently used in process tomography. We focus in detail on the example of a spin qubit formed by the singlet-triplet subspace of two electron spins in a GaAs double quantum dot, although our approach is quite general.
@article{arxiv.1306.1013,
title = {Tomography of a spin qubit in a double quantum dot},
author = {Maki Takahashi and Stephen D. Bartlett and Andrew C. Doherty},
journal= {arXiv preprint arXiv:1306.1013},
year = {2013}
}
Comments
10 pages, 5 figures, comments welcome; v2 published version