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Quantum Computing

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  • $\begingroup$ You can take the line defined by the antipodal points $\{ \vert + \rangle, \vert - \rangle\}$ in the Bloch sphere and represent any point inside this line, because it will represent the convex combination between the two possibilities after measurement. $\endgroup$ Commented Oct 30, 2022 at 18:46
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    $\begingroup$ In your attempy, you are missing a factor of $\frac{1}{2}$ for the action of your projectors on the current density operator. So the overall scalar should be $\frac{1}{8}$. $\endgroup$ Commented Oct 31, 2022 at 14:16