We propose novel coherent-state phase concentration by probabilistic measurement-induced ampli- fication. The amplification scheme uses novel architecture, thermal noise addition (instead of single photon addition) followed by feasible multiple photon subtraction using realistic photon-number resolving detector. It allows to substantially amplify weak coherent states and simultaneously reduce their phase uncertainty, contrary to the deterministic amplifier.
@article{arxiv.0907.2402,
title = {Coherent-state phase concentration by quantum probabilistic amplification},
author = {Petr Marek and Radim Filip},
journal= {arXiv preprint arXiv:0907.2402},
year = {2015}
}