Strong Converse Exponent for Entanglement-Assisted Communication

Understand

We determine the exact strong converse exponent for entanglement-assisted classical communication of a quantum channel.

• Our main contribution is the derivation of an upper bound for the strong converse exponent which is characterized by the sandwiched R\'enyi divergence.
• It turns out that this upper bound coincides with the lower bound of Gupta and Wilde (Commun.
• Math.