Slow phase relaxation can prevent meltdown in quantum computers
We show that phase memory can be much longer than energy relaxation in systems with exponentially large dimensions of Hilbert space ; this finding is documented by fifty years of nuclear experiments, though the information is somewhat hidden. For quantum computers Hilbert spaces of dimention of 2^100 (2 in power 100) or larger will be typical and therefore this effect may contribute significantly to reduce the problems of scaling of quantum computers to a useful number of qubits. We propose a theoretical interpretation of the anomalously long phase memory based on the study of highly excited microscopic many-body systems [2-5].
 J. Flores, S.Yu. Kun, T. Seligman, submitted.
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