About the book
This book is devoted to discussing several topics on quantum information science. Studying this subject, we see its consequences are related to quantum effects in physics. We realize that quantum theory and the interpretation of quantum mechanics are responsible for various theoretical progress and experimental topics, visioning quantum devices' implementation. However, the understanding of quantum physics and engineering is a serious challenge to solve. In the last decade, quantum information science development is considerable compared to before two decades ago, or more, and some remarkable progress in manufacturing quantum computers are observed recently. The discussion of topics related to quantum information science is now crucial. For this reason, several efforts made to discuss topics addressed from the fundamentals to applications is relevant. In the current issue, theoretical background and other topics such as quantum communication, quantum algorithm, other applications as quantum complexity, and physical implementations, including other quantum information topics, are welcome.