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Depolarizing channel on GHZ-state

Either can be considered (except I think you've got your values of $d$ swapped around, but that's easy to check because you want your output to have trace 1 if your input did). In terms of which is ...
DaftWullie's user avatar
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3 votes

Deriving the choi matrix definition of the quantum depolarizing channel

For $\mathcal E(X)=p\mathrm{tr}(X)\,\frac{\mathbb I}{2}+(1-p)X$, then $$\begin{align} \sigma &= (\mathcal E \otimes \mathbb I)(|\Omega\rangle\langle \Omega|)\\ &= \sum_{ij} \mathcal E(|i\...
HerrWarum's user avatar
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6 votes
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Decoding the Steane Code

The error correction protocol for any CSS code (such as the Steane code) is described in e.g. Section 10.4.2 of Nielsen & Chuang, although it's much easier to understand in the stabilizer picture. ...
ChrisD's user avatar
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