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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.
Repetition is probably the simplest method of error control. If an experiment fails, repeat it, and do so until it eventually succeeds. Quantum mechanics gives leeway for alternative approaches.
A tighter limit on the half-life of a tellurium nucleus for 'neutrinoless double-beta decay' marks progress towards a better understanding of the ever-elusive neutrinos and the measurement of their mass.