For any two-qubit gate's Cartan kernel, product and entangled probe states achieve the joint-estimation bound p=3/4 with vanishing quantum incompatibility and minimum sloppiness s=1/64.
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Cartan Quantum Metrology
For any two-qubit gate's Cartan kernel, product and entangled probe states achieve the joint-estimation bound p=3/4 with vanishing quantum incompatibility and minimum sloppiness s=1/64.