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This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.
In a quantum error-correcting code, the codespace is the subspace of the overall Hilbert space where all logical states live. In an n {\displaystyle n} -qubit stabilizer code , we can describe this subspace by its Pauli stabilizing group, the set of all n {\displaystyle n} -qubit Pauli operators which stabilize every logical state.
That these codes allow indeed for quantum computations of arbitrary length is the content of the quantum threshold theorem, found by Michael Ben-Or and Dorit Aharonov, which asserts that you can correct for all errors if you concatenate quantum codes such as the CSS codes—i.e. re-encode each logical qubit by the same code again, and so on, on ...