Non-Reciprocal Amplification of Light Using Cold Atoms Coupled to an Optical Nanofiber Sebastian Pucher, Christian Liedl, Shuwei Jin, Arno Rauschenbeutel and Philipp Schneeweiss EPJ Web Conf., 266 (2022) 11012 Published online: 13 October 2022 DOI: 10.1051/epjconf/202226611012