Fig. 3
From: Post-variational classical quantum transfer learning for binary classification
Three different post variational strategies for CQTL. (a) Modified observable construction approach, which measures a quantum feature map in different Pauli basis, making it post-variational. (b) A hybrid approach where a fixed quantum circuit is parameterized by a classical model. (c) A Variational with Post-Variational measurement approach: a Parameterized Ansatz is measured using all Pauli operators instead of the standard Pauli Z in a regular Parameterized Ansatz, making it a post-variational method.
