Demonstration of Near-Optimal Discrimination of Optical Coherent States
Christoffer Wittmann, Masahiro Takeoka, K. N. Cassemiro, Masahide Sasaki, Gerd Leuchs, Ulrik L. Andersen · Physical Review Letters · 2008
The optimal discrimination of nonorthogonal quantum states with minimum error probability is a fundamental task in quantum measurement theory as well as an important primitive in optical communication. In this work, we propose and experimentally realize a new and simple quantum measurement strategy capable of discriminating two coherent states with smaller error probabilities than can be obtained using the standard measurement devices: the Kennedy receiver and the homodyne receiver.