01538nas a2200157   4500008004100000022001400041245012800055210006900183260001200252300002000264490000600284520091800290100001901208700002401227856012901251       2020                        eng d  a2169-353600aConstellation Optimization for Phase-Shift Keying Coherent States With Displacement Receiver to Maximize Mutual Information0 aConstellation Optimization for PhaseShift Keying Coherent States  c11/2020  a224409–2244190 v83 a<p>An important problem in quantum information theory is finding the best possible capacity of the optical communication channel employing suitable codewords, receiver design, and constellation optimization techniques. In this paper, we derive an alternative channel capacity, $C_G$ , of phase-shift keying coherent state with a realizable displacement receiver by maximizing mutual information over symbol priors and pre-detection displacement. We find that&nbsp;$C_G$ is higher than the capacity achieved by maximizing mutual information over symbol prior but with zero displacements. The overall scheme demonstrates designing an improved, yet easy-to-implement receiver for better communication performance by tuning it at different photon number regime. Further, we present a comparative analysis of&nbsp;CG&nbsp;with existing receiver designs. We extend our study to account for detector imperfections.</p>
1 aBhadani, Rahul1 aDjordjevic, Ivan, B  uhttps://csl.arizona.edu/content/constellation-optimization-phase-shift-keying-coherent-states-displacement-receiver-maximize