00750nas a2200145 4500008004100000245003600041210003600077300001400113490000700127520036400134653001600498100001400514700002000528856005600548 2003 eng d00aCompatibility of quantum states0 aCompatibility of quantum states a010101(R)0 v673 aWe introduce a measure of the compatibility between quantum statesâ€“-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.10aFoundations1 aPoulin, D1 aBlume-Kohout, R uhttps://www.physique.usherbrooke.ca/pages/node/6211