Universal quantum cloning is impossible in noncontextual hidden-variable theories because the required confusability-preserving transformation forces confusability to take only discrete values, contradicting the continuity of arbitrary input states.
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Universal quantum cloning beyond noncontextual theory
Universal quantum cloning is impossible in noncontextual hidden-variable theories because the required confusability-preserving transformation forces confusability to take only discrete values, contradicting the continuity of arbitrary input states.