On ibm_fez, the noiseless geometry of a fixed four-qubit ZZ kernel survives to CKA 0.933–0.989, gate twirling is the most faithful configuration, and the apparent label-alignment uplift is a normalization artifact, not signal.
Beyond accuracy: a kernel-level comparative analysis of quantum and classical support vector ma- chines
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Statevector-Referenced Geometry Survival of a Four-Qubit ZZ Quantum Kernel on IBM Quantum Hardware: A Fixed-Subset Diagnostic Across Three Execution Configurations
On ibm_fez, the noiseless geometry of a fixed four-qubit ZZ kernel survives to CKA 0.933–0.989, gate twirling is the most faithful configuration, and the apparent label-alignment uplift is a normalization artifact, not signal.