For a 'real life' quantum computer, mere capability is not good enough. It also has to defy disturbances attempting to weaken its special powers. To succeed, the task has to be addressed on various levels.
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Lidar, D. Against the odds of imperfection. Nature Phys 1, 145–146 (2005). https://doi.org/10.1038/nphys182
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DOI: https://doi.org/10.1038/nphys182
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