2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93634In quantum communication via noisy channels, the error probability scales exponentially with the length of the channel. We present a scheme of a quantum repeater that overcomes this limitation. The central idea is to connect a string of (imperfect) entangled pairs of particles by using a novel nested purification protocol, thereby creating a single distant pair of high fidelity. The scheme tolerates general errors on the percent level.8 pages, 3 figures, 1 tableQuantum Physicstext