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appunti-steffo/7 - Introduction to quantum information processing/1 - Concetti base/proiezione.md

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[[Operazione]] che restitusce il coefficiente dello stato $\ket{1}$ di un dato [[qbit]].
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$$
\Huge
\mathbf{n}_x = \ket{x}\bra{x}
$$
==È giusto?==
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$$
\Huge
\mathbf{n}_0
=
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\ket{0}
\bra{0}
=
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\begin{bmatrix}
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0 & 0 & 0 & 0 \\
0 & 1 & 0 & 0 \\
0 & 0 & 0 & 0 \\
0 & 0 & 0 & 0
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\end{bmatrix}
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$$
==È giusto?==
$$
\Huge
\mathbf{n}_1
=
\ket{1}
\bra{1}
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=
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\begin{bmatrix}
0 & 0 & 0 & 0 \\
0 & 0 & 0 & 0 \\
0 & 0 & 0 & 0 \\
0 & 0 & 0 & 1
\end{bmatrix}
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$$