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Metric Self-Dual Completion and Optimal Additive Hardness for Quantum and Graph-State Distance
We prove that the quantum code distance is NP-hard to approximate within an additive error of $c N$, for some constant $c >0$, where $N$ is the number of qubits. Our reductions are deterministic. This improves the previous square-root additive gap to $Ω(N)$ and resolves the explicitly stated linear-
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