We address quantum $ M $-ary phase-shift keyed communication channels in the presence of phase diffusion and analyze the use of probabilistic noiseless linear amplifiers (NLAs) to enhance performance of coherent signals. We consider both static and dynamical phase diffusion and assess the performances of the channel for ideal and realistic phase receivers. Our results show that NLA employed at the stage of signal preparations is a useful resource, especially in the regime of weak signals. We also discuss the interplay between the use of NLA and the memory effects occurring with dynamical noise in determining the capacity of the channel.
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