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operation and performance. Quantum error-correcting codes restore a noisy,
[[decoherence|decohered]] [[quantum state]] to a pure quantum state. A
[[Group action (mathematics)#Orbits and stabilizers|stabilizer]] quantum error-correcting code appends [[Ancilla (quantum computing)|ancilla qubits]]
to qubits that we want to protect. A unitary encoding circuit rotates the
global state into a subspace of a larger [[Hilbert space]]. This highly [[Quantum entanglement|entangled]],
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