Shen, Yu ChenYu ChenShenGao, LiLiGaoHAO-CHUNG CHENG2023-10-192023-10-192023-01-01978166547554921578095https://scholars.lib.ntu.edu.tw/handle/123456789/636212In this paper, we consider the standard quantum information decoupling, in which Alice aims to decouple her system from the environment by discarding some of her systems. To achieve an ?-decoupling with trace distance as the error criterion, we establish a one-shot characterization for the largest size of the remainder system in terms of the conditional (1 - ?)-hypothesis-testing entropy. When the underlying system is independent and identically prepared, our result leads to the matched second-order rate as well as the moderate deviation rate.conference paper10.1109/ISIT54713.2023.102065022-s2.0-85171427388https://api.elsevier.com/content/abstract/scopus_id/85171427388