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appunti-steffo/7 - Introduction to quantum information processing/5 - Cose strane/Hardy state.md

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Particolare [[qbit|stato]] di due [[qbit]] composto nel seguente modo:
$$
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\Large
\displaylines{
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\ket{\Phi}
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=\\\\
\frac{1}{\sqrt{3}}\ \par{\ 2 \cdot \ket{00} - 1 \cdot \mathbf{H_1} \mathbf{H_0} \ket{11}\ }
=\\\\
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\frac{
3 \cdot \ket{00} +
1 \cdot \ket{01} +
1 \cdot \ket{10} -
1 \cdot \ket{11}
}{\sqrt{12}}
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}
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$$
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Se ad entrambi i [[qbit]] viene applicato un [[Hadamard gate]], gli stati $\ket{01}$ e $\ket{10}$ cessano di essere possibili, dando origine al fenomeno della [[spooky action at a distance]].