Quantum-enhanced receiver for quadrature phase shift keying using conjugated homodyne detection Tianyi Wu, Yang Ran, Zichao Zhou, Chang Guo, Kai Li and Chen Dong EPJ Quantum Technol., 10 1 (2023) 12 Published online: 02 May 2023 DOI: 10.1140/epjqt/s40507-023-00169-y