Non-Reciprocal Amplification of Light Using Cold Atoms Coupled to an Optical NanofiberSebastian Pucher, Christian Liedl, Shuwei Jin, Arno Rauschenbeutel and Philipp SchneeweissEPJ Web Conf., 266 (2022) 11012DOI: https://doi.org/10.1051/epjconf/202226611012