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Observables (5 min)

Which of the following matrices could describe physical observables in a Hilbert space of two states ?

$\displaystyle A = \left( \begin{array}{cc}
1 & 1\\
0 & 2
\end{array}\right) ,\...
...right),\quad
D = \left( \begin{array}{cc}
0 & -i\\
i & 0
\end{array}\right).
$



Tobias Brandes 2004-02-04