In quantum information, the gnu code refers to a particular family of quantum error correcting codes, with the special property of being invariant under permutations of the qubits. Given integers g (the gap), n (the occupancy), and m (the length of the code), the two codewords are where are the consisting of a uniform superposition of all weight-k words on m qubits, e.g. The real parameter scales the density of the code. The length , hence the name of the code. For odd and , the gnu code is capable of correcting erasure errors, or deletion errors.
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