2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/156860We show that a continuous quantum non-demolition measurement of the energy of a nanomechanical resonator can be achieved by monitoring the resonator with a quantum point contact via a Cooper-pair box. This technique can further be used to prepare highly non-classical states of two resonators, such as canonical phase-reference states, and so-called "noon" states.4 pages, revtex 4, 3 eps figures. v2: improvements to presentationQuantum PhysicsMesoscale and Nanoscale Physicstext