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Quantum No-Cloning Theorem ?

Widdekind
in Quantum Theory

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According to The Teaching Company [Great Courses] Impossible: Physics beyond the Edge (lecture 21), the Quantum No-Cloning Theorem denies the possibility of "perfect" copying of quantum states. So, what is the "best" quantum copying which can be created ? Could you "quasi-clone" a quantum system with, say, 90% fidelity ?

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