Variational quantum eigensolver with fewer qubits
Jin-Guo Liu, Yi-Hong Zhang, Yuan Wan, Lei Wang · Physical Review Research · 2019
Scalability in a variatonal quantum eigensolver is limited by both the number of qubits available and the gradient vanishing problem. This paper shows several types of tensor network inspired circuit ansatzes. These are area law entangled, qubit efficient, and experimentally feasible while not having exponential contraction complexity problem as in their classical counterpart.