Equation 48 · A Reference Frame Becomes Classical by Publishing Its Orientation

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[0,\pi]

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\pi

Symbol pi

the values from zero to.

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What the article says around this equation

This expression follows from the Haar distribution of rotation angle, whose density on [0, $\pi$ ] is 2 $\sin^2(\theta/2)$ / $\pi$ . It passes the limiting checks: at $\epsilon$ =0 , blind success is zero; at $\epsilon$ = $\pi$ , it is one. The redundancy definition is informative only when 1- $\delta$ > $p_{\mathrm{blind}}(\epsilon)$ . Otherwise an empty box can qualify as a witness.

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