Improvement of Quasi-Optimum Quantum Receiver for 3-PSK Coherent-State Signals
Asami Imaeda, Masahiro Yoshikawa, Tsuyoshi Goto Sasaki · IEEJ Transactions on Electronics Information and Systems · 2009
The quasi-optimum quantum receiver proposed by Yamazaki can not necessarily overcome the standard quantum limit that is achieved by the heterodyne receiver for any average number of photons. We improve the quasi-optimum quantum receiver and show that our scheme always overcomes the standard quantum limit for 3-PSK signals.