The No Cloning Theorem
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Why can’t a quantum state simply be copied like a computer file? minutephysics uses Schrödinger’s cat to introduce the no-cloning theorem and the reasoning behind it. The creator’s explanation connects linear quantum transformations with the impossibility of perfectly copying an arbitrary unknown state. This 2016 explainer is a useful starting point before quantum teleportation: the two ideas describe different operations, so the ability to transfer a state does not provide a universal quantum photocopier.
Video by minutephysics. Added to QubitWire .