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For the following Bloch sphere representation of a qubit, what does the highlighted symbol mean? I'm not sure if it means anything or it's just for showing that it's a sphere, not a circle. enter image description here

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It's just showing the three-dimensionality of the sphere. Most representations I've seen don't add that since the dotted ellipse already communicates the idea of a sphere. For example:

enter image description here

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