Quantifying Process Nonclassicality in Bosonic Fields**Supported by the Young Scientists Fund of the National Natural Science Foundation of China under Grant No 11605006, the National Natural Science Foundation of China under Grant No 11875317, the National Center for Mathematics and Interdisciplinary Sciences of Chinese Academy of Sciences under Grant No Y029152K51, and the Key Laboratory of Random Complex Structures and

Abstract

Nonclassicality of optical states, as a key characteristic of bosonic fields, is a valuable resource for quantum information processing. We investigate the generation of nonclassicality in quantum processes from a quantitative perspective, introduce three information-theoretic measures of nonclassicality for quantum-optical processes based on the Wigner–Yanase skew information and coherent states, and illustrate their physical significance through several well-known single-mode quantum processes.