Compatibility of quantum states
arXiv:quant-ph/0205033 · doi:10.1103/PhysRevA.67.010101
Abstract
We introduce a measure of the compatibility between quantum states--the likelihood that two density matrices describe the same object. Our measure is motivated by two elementary requirements, which lead to a natural definition. We list some properties of this measure, and discuss its relation to the problem of combining two observers' states of knowledge.
4 pages, no figures