Qubit channels which require four inputs to achieve capacity: implications for additivity conjectures

Masahito Hayashi, Hiroshi Imai, Keiji Matsumoto, Mary Beth Ruskai, Toshiyuki Shimono. Qubit channels which require four inputs to achieve capacity: implications for additivity conjectures. Quantum Information & Computation, 5(1):13-31, 2005. [doi]

Abstract

Abstract is missing.