2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93440The problem of photon adding and subtracting is studied, using conditional output measurement on a beam splitter. It is shown that for various classes of states the corresponding photon-added and -subtracted states can be prepared. Analytical results are presented, with special emphasis on photon-added and -subtracted squeezed vacuum states, which are found to represent two different types of Schroedinger-cat-like states. Effects of realistic photocounting and Fock-state preparation are discussed.Presented at the 5-th International Conference on Squeezed States and Uncertainty Relations (4 ps-figures)Quantum Physicstext