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We describe and characterize an equal-fidelity surface in Bloch spacetargeted for a qubit state by means of equal-distance concept. The distance isgeneralized and defined as the Euclidean distance between extended Blochvectors for arbitrary dimensional states. The distance is a genuine distanceaccording to the definition and is related to other distances between quantumstates and super-fidelity.

Equal-fidelity surface for a qubit state via equal-distance extended Bloch vectors and derivatives