Deep variational quantum eigensolver for excited states and its application to quantum chemistry calculation of periodic materials

Understand

A programmable quantum device that has a large number of qubits without fault-tolerance has emerged recently.

• Variational Quantum Eigensolver (VQE) is one of the most promising ways to utilize the computational power of such devices to solve problems in condensed matter physics and quantum chemistry.
• As the size of the current quantum devices is still not large for rivaling classical computers at solving practical problems, Fujii et al.
• proposed a method called "Deep VQE" which can provide the ground state of a given quantum system with the smaller number of qubits by combining the VQE and the technique of coarse-graining [K.