Alternative representation of N \times N density matrix
Quantum Physics
2007-05-23 v1
Abstract
We use polarization operators known from quantum theory of angular momentum to expand the dimensional density operators. Thereby, we construct generalized Bloch vectors representing density matrices. We study their properties and derive positivity conditions for any . We also apply the procedure to study Bloch vector space for a qubit and a qutrit.
Cite
@article{arxiv.quant-ph/0602065,
title = {Alternative representation of N \times N density matrix},
author = {Stanislaw Kryszewski and Mateusz Zachcial},
journal= {arXiv preprint arXiv:quant-ph/0602065},
year = {2007}
}
Comments
22 pages, 7 figures