Q. Yuan
College of Mathematics, Institute of Mathematics, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, P.R. China.
[ 1 ] - The witness set of coexistence of quantum effects and its preservers
One of unsolved problems in quantum measurement theory is to characterize coexistence of quantum effects. In this paper, applying positive operator matrix theory, we give a mathematical characterization of the witness set of coexistence of quantum effects and obtain a series of properties of coexistence. We also devote to characterizing bijective morphisms on quantum effects leaving the witness...