Towards the ultimate limits of quantum channel discrimination and quantum communication

Understand

Distinguishability is fundamental to information theory and extends naturally to quantum systems.

• While quantum state discrimination is well understood, quantum channel discrimination remains challenging due to the dynamic nature of channels and the variety of discrimination strategies.
• This work advances the understanding of quantum channel discrimination and its fundamental limits.
• We develop new tools for quantum divergences, including sharper bounds on the quantum hypothesis testing relative entropy and additivity results for channel divergences.