Game-theoretic characterization of antidegradable channels
Francesco Buscemi, Nilanjana Datta, Sergii Strelchuk · Journal of Mathematical Physics · 2014
We introduce a guessing game involving a quantum channel, three parties—the sender, the receiver, and an eavesdropper, Eve—and a quantum public side channel. We prove that a necessary and sufficient condition for the quantum channel to be antidegradable, is that Eve wins the game. We thus obtain a complete operational characterization of antidegradable channels in a game-theoretic framework.