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In the three-qubit bit flip code, why can the first bit flip without impacting the entanglement with the other qubits?
The principle of the three-qubit Bit Flip Code is straight forward at first sight. Using CNOT you basically encode
$$a|0\rangle + b|1\rangle $$
to
$$ a|000\rangle + b|111\rangle$$
using ...
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