Remarks on concavity of the auxiliary function appearing in quantum reliability function

K. Yanagi, S. Furuichi, K. Kuriyama
2003 IEEE International Symposium on Information Theory, 2003. Proceedings.  
Concavity of the auxiliary function which appears in the random coding exponent as the lower bound of the quantum reliability function for general quantum states is proved for 0 ≤ s ≤ 1 in two dimensional case.
doi:10.1109/isit.2003.1228473 fatcat:2dve4mrdszdx3k6vbmb4xua7oa