2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/167166We study decoherence of a three-qubit array coupled to substrate phonons. Assuming an initial three-qubit entangled state that would be decoherence-free for identical qubit positions, allows us to focus on non-Markovian effects of the inevitable spatial qubit separation. It turns out that the coherence is most affected when the qubits are regularly spaced. Moreover, we find that up to a constant scaling factor, two-qubit entanglement is not influenced by the presence f the third qubit, even though all qubits interact via the phonon field.4 pages, 3 figuresMesoscale and Nanoscale PhysicsQuantum Physicstext