Can anyone with basic knowledge of Dicke States assist with explaining how we arrive at equation (4) in the paper 'Entanglement detection in the vicinity of arbitrary Dicke states': <Moderator's note: link fixed>(adsbygoogle = window.adsbygoogle || []).push({});

$$\langle J^2_{x} \rangle_{\mu} = \sum_{i_1,i_2} \langle J_{xi_{_1}} \rangle_{\mu} \langle J_{xi_{_2}} \rangle_{\mu} + \sum_{i}\langle ( \Delta J_{xi})^2 \rangle_{\mu}~~~~~~~~~~~~~(4)$$

Any assistance is appreciated.

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# A Equation in a paper about Dicke states

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