One-qubit reduced states of a pure many-qubit state: polygon inequalities
Quantum Physics
2016-09-08 v2
Abstract
We show that a necessary and sufficient condition for a set of one-qubit mixed states to be the reduced states of a pure -qubit state is that their smaller eigenvalues should satisfy polygon inequalities: no one of them can exceed the sum of the others.
Cite
@article{arxiv.quant-ph/0209085,
title = {One-qubit reduced states of a pure many-qubit state: polygon inequalities},
author = {A. Higuchi and A. Sudbery and J. Szulc},
journal= {arXiv preprint arXiv:quant-ph/0209085},
year = {2016}
}
Comments
Contains some further discussion of the results. Published version