Think of a quantum computer's qubit as a delicate glass. Today's qubits: a glass that spills every time you take a step (1 error/1,000 quantum ops).
What we need: A sealed travel mug that never spills (a billion times better).
Solution: Bundle many fragile glasses into one super-stable crate. That crate is a "logical qubit."
That's Quantum Error Correction in a nutshell.
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