You cannot copy an unknown quantum state. This is not an engineering limitation that better technology might overcome. It is a mathematical consequence of the structure of quantum mechanics, proven by William Wootters and Wojciech Zurek in 1982. Dennis Dieks
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Month: September 2026
Stabilizers
The fundamental paradox of quantum error correction is that you cannot look at your data. Measuring a quantum state forces it to collapse into classical bits, destroying any delicate superposition. Furthermore, the laws of physics forbid copying unknown quantum information
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