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: each of them must be no greater than the sum of the others.
- Received 26 September 2002
DOI:https://doi.org/10.1103/PhysRevLett.90.107902
©2003 American Physical Society