This book is intended for theoretical and experimental researchers who are interested in ferroelectrics and advanced memory. After introducing readers to dielectric, perovskites, advanced memories, and ferroelectric, it explains quantum simulation. Then, using molecular orbital calculation results, it explains the ferroelectric mechanism in perovskite titanium oxides in concrete terms. Lastly, the book examines the materials designed for high-performance ferroelectrics and discusses the future of high-speed memory.