Classical Splitting of Parametrized Quantum Circuits

Understand

Barren plateaus appear to be a major obstacle to using variational quantum algorithms to simulate large-scale quantum systems or replace traditional machine learning algorithms.

• They can be caused by multiple factors such as expressivity, entanglement, locality of observables, or even hardware noise.
• We propose classical splitting of ans\"atze or parametrized quantum circuits to avoid barren plateaus.
• Classical splitting is realized by splitting an $N$ qubit ansatz to multiple ans\"atze that consists of $\mathcal{O}(\log N)$ qubits.