Many-particle localization by constructed disorder: enabling quantum computing with perpetually coupled qubits

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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 10⁶ already for a narrow energy bandwidth. The results show viability of quantum computers with time-independent qubit coupling.