No Cloning

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Three Blue One Brown:
Why you can’t clone Schrödinger’s cat: this video presents the full proof of the “No Cloning” Theorem in Quantum Mechanics – without any fancy math! (stereotypical qubit has been replaced with Schrödinger’s cat).
The full proof relies on the linearity of quantum (aka unitary) transformations, and the tensor product of multiple systems, to show that perfect cloning is impossible (though teleportation is allowed)
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REFERENCES:
The No-Cloning Theorem:
MinutePhysics on Schrödinger’s Cat:
Original No-Cloning Paper by Wootters and Zurech:
Original “Beyond No-Cloning” (ie, no-cloning workarounds) paper by Buzek & Hillery:
Optimal Quantum Cloning paper:
Optimal Quantum Cloning paper II:
Quantum Cloning:
The History of Schrödinger’s (& Einstein’s) Cat:
The Stability of Black Powder (from the Civil War!):
Proof by contradiction:
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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!
Created by Henry Reich
Music by Nathaniel Schroeder