Fig. 4
From: Post-variational classical quantum transfer learning for binary classification
Quantum circuit with feature map S(x) measured in pauli operators \(P \in {I,X,Y,Z}^{\otimes N}\) possible combinations. For N qubits it is \(4^N\) combinations. By applying Pauli truncation and the classical shadows protocol, the number of measurements required is reduced to a logarithmic dependence on the number of qubits.
