Quantum process tomography of a single solid state qubit
Mark Howard, Jason Twamley, Christoffer Wittmann, T. Gaebel, Fedor Jelezko, Jörg Wrachtrup · arXiv (Cornell University) · 2005
We present an example of quantum process tomography performed on a single solid state qubit. The qubit used is two energy levels of the triplet state in the Nitrogen-Vacancy defect in Diamond. Quantum process tomography is applied to a qubit which has been allowed to decohere for three different time periods. In each case the process is found in terms of the $χ$ matrix representation and the affine map representation. The discrepancy between experimentally estimated process and the closest physically valid process is noted.