Channel matrix, measurement matrix and collapsed matrix in teleportation
  In this paper, two kinds of coefficient matrixes (channel matrix, measurement matrix)associated with the pure state for teleportation are presented, the general relation among channel matrix, measurement matrix and collapsed matrix is obtained. In addition, a criterion for teleportation that the number of coefficient of an unknown state is determined by the rank of the collapsed matrix is given. 
Xin-Wei Zha, Jian-Xia Qi, Hai-Yang Song
quant-ph