Remove material, reorganize cells in reptition code tutorial #4624
+18
−20
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Two editing changes to tighten up the "Repetition codes" tutorial
Omit the discussion of stabilizers, which is more advanced than this tutorial. For example, the paper linked in the tutorial does not mention stabilizers until after a thorough discussion of background topics as well as the 3-qubit bit-flip code and the 9-qubit code. The same is true in Gottesman's recent book. I did retain the link to more information about QEC, which does discuss stabilizer codes.
Move the cell that gets a backend from "Step 1" to "Setup". It seems clear that it belongs in setup. I doubt the current organization is intentional.
Note
This #4287 (comment) proposes changing too many things at once. I think it will be easier to review this way. The present PR does not address the question of variable names, which is the topic of #4287. I'll do that in a separate PR. @matteo-piccolini