Manuscript Oai211-A@1 · Oai211-A.tex · section · 3f3e4f63

A coordinate estimate

Finite-dimensional channel marks › A coordinate estimate · lines 656–665

Let

Φ_{d} = \frac{1}{d} i = 0 \sum^{d - 1} ∣ i ⟩ ∣ i ⟩, P_{d} = ∣ Φ_{d} ⟩ ⟨ Φ_{d} ∣, J_{Δ} = (id \otimes Δ) (P_{d}) .

The normalized Choi matrix of a channel is a density matrix.

Displayed formulas in this passage

unlabeled · line 659
$Φ_{d} = \frac{1}{d} i = 0 \sum^{d - 1} ∣ i ⟩ ∣ i ⟩, P_{d} = ∣ Φ_{d} ⟩ ⟨ Φ_{d} ∣, J_{Δ} = (id \otimes Δ) (P_{d}) .$