Variational Quantum Eigensolver with Reduced Circuit Complexity

Understand

The variational quantum eigensolver (VQE) is one of the most promising algorithms to find eigenvalues and eigenvectors of a given Hamiltonian on noisy intermediate-scale quantum (NISQ) devices.

• A particular application is to obtain ground or excited states of molecules.
• The practical realization is currently limited by the complexity of quantum circuits.
• Here we present a novel approach to reduce quantum circuit complexity in VQE for electronic structure calculations.