Strong Converse Exponents of Quantum Soft Covering and Privacy Amplification

Shi-Bing Li, Hongsen Qiu, Xinyu Zhang

We determine the exact strong converse exponent of quantum soft covering under the sandwiched R{é}nyi divergence for all orders $\alpha \in [\frac{1}{2},\infty )$. For $α\in[\frac{1}{2},1)…