Quantinuum develops a backpropagation algorithm for evaluating parameter gradients in quantum circuits using Pauli propagation simulation. The method has computational complexity comparable to standard sparse Pauli simulation techniques, while producing gradients with accuracy of the same order as the corresponding observable expectation values.
Quantinuum’s Backpropagation Algorithm Rivals Sparse Pauli Simulation Speed
Quantinuum develops a backpropagation algorithm for evaluating parameter gradients in quantum circuits using Pauli propagation simulation. The method has computational complexity comparable to standard sparse Pauli simulation techniques, while producing gradients with accuracy of the same order as the corresponding observable expectation values.