We know that Bloch sphere is a good way to represent a qubit(two energy quantum systems). Now I want to know the tangent vector in Bloch sphere, e.g. for states , or equivalently with coordinate: . We can calculate the tangent vector by . My question is, is there a way to calculate a quantity similar to without refer to coordinates? Because I want to see what the tangent vector correspond to -qubits instead of single qubit case, in that case, we can't seek help from coordinates.
Directly get tangent vector of Bloch sphere from quantum state (qubit)?
Sherlock
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