The Importance of Being Unistochastic
Quantum Physics
2007-05-23 v1
Abstract
A bistochastic matrix is a square matrix with positive entries such that rows and columns sum to unity. A unistochastic matrix is a bistochastic matrix whose matrix elements are the absolute values squared of a unitary matrix. We can now ask questions such as when a given bistochastic matrix is unistochastic. I review these questions: Why they are asked, why they are difficult to answer, and what is known about them.
Cite
@article{arxiv.quant-ph/0403088,
title = {The Importance of Being Unistochastic},
author = {Ingemar Bengtsson},
journal= {arXiv preprint arXiv:quant-ph/0403088},
year = {2007}
}
Comments
8 pages, contribution to the Second Vaxjo Conference of Quantum Theory: Reconsideration of Foundations