  We demonstrate that, in a many-particle system, particles can be strongly
confined to their sites. The localization is obtained by constructing a
sequence of on-site energies that efficiently suppresses resonant hopping. The
time during which a many-particle state remains strongly localized in an
infinite chain can exceed the reciprocal hopping frequency by $\agt 10^6$
already for a narrow energy bandwidth. The results show viability of quantum
computers with time-independent qubit coupling.
