Maintaining coherence in quantum computers.

@article{Unruh1994MaintainingCI,
  title={Maintaining coherence in quantum computers.},
  author={W. G. Unruh},
  journal={Physical review. A, Atomic, molecular, and optical physics},
  year={1994},
  volume={51 2},
  pages={
          992-997
        },
  url={https://api.semanticscholar.org/CorpusID:13980886}
}
It is found that for quantum calculations (in which the maintenance of coherence over a large number of states is important), not only must the coupling be small, but the time taken in the quantum calculation must be less than the thermal time scale.
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