The previously reported Euler characteristic number for the two-band model is non-integer for |h|>1, and after a boundary correction it becomes a constant 4, so it cannot be used to identify the topological phase transition.
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Note on "Experimental Measurement of Quantum Metric Tensor and Related Topological Phase Transition with a Superconducting Qubit"
The previously reported Euler characteristic number for the two-band model is non-integer for |h|>1, and after a boundary correction it becomes a constant 4, so it cannot be used to identify the topological phase transition.