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This book is designed to help both seasoned experts and aspiring learners of quantum computing build new skills, deepen their understanding, and save time and energy for the work they are passionate about. Quantum computing is a remarkable blend of quantum mechanics, computer science, and information theory, and it is reshaping how we understand and utilize information. Today, as the world witnesses a surge of exciting advances in this field, it has become more vital than ever to explore the nature of quantum mechanics in depth, gaining a richer understanding of its role in how information is stored, transformed, and retrieved. This book aims to guide readers on this journey, making complex ideas approachable, intriguing, and rewarding. More than just an introduction, this book covers the evolution, current state, and future directions of quantum computing, making it a truly comprehensive resource. It explores promising application areas such as cryptography, communications, cybersecurity, and teleportation. Its structure is intentionally inclusive, providing foundational knowledge for newcomers through chapters that use simple language and approachable examples, while also addressing the interests of researchers, practitioners, and academics with advanced sections that highlight state-of-the-art technologies, trends, and opportunities for further exploration. In doing so, this book stands apart from many others in the field by offering both breadth and depth, making it an invaluable resource for anyone seeking to understand and shape the future of quantum computing. This book is designed for a broad and diverse audience that includes junior and senior undergraduate students, graduate students, researchers, academics, and industry professionals. It will be valuable to teaching professionals as well as students pursuing undergraduate, postgraduate, and doctoral degrees across disciplines, such as computer science, engineering, mathematics, and physics. It is ideal for those with a keen interest in quantum computing and a basic understanding of mathematics, making it accessible to readers at many levels of expertise. Its global approach ensures its applicability to readers from every corner of the world, making it a strong resource for university courses and a reliable reference for departments of Computer Science, Mathematics, and Physics. The book is equally suited to professional and industrial readers, serving as a symbolic and authoritative reference for both public and private sector applications. Its relevance will only continue to grow as quantum computing finds its place in critical fields such as pharmaceuticals, materials science, and beyond. As research institutions and centers of innovation adopt quantum computing for tackling complex and impactful challenges, this book will serve as a trusted guide for students, researchers, and professionals alike, providing a foundation for understanding the theoretical underpinnings, practical applications, and future potential of this revolutionary technology. Quantum computing is an intriguing field that sits at the crossroads of quantum mechanics, computer science, and information theory. Yet for many, it still feels abstract and elusive. We felt a deep motivation to write this book precisely because the field has advanced far enough that it can no longer be treated as an obscure area of theoretical research. The time is right for a comprehensive resource that makes quantum computing approachable, addressing the knowledge and notation gaps that often separate traditional computing from its quantum counterpart. This book aims to give readers a solid foundation and to illuminate the connections between the theory and its evolving practical implementations. Although quantum computing has progressed remarkably, it is still very much an active area of exploration. Even experts disagree about which methods and approaches will dominate in the future. We wrote this book to open the door to a broad range of readers, from teaching professionals and university students at every level, to engineers, mathematicians, researchers, and enthusiasts with a basic understanding of math. The text goes beyond theory, highlighting concrete applications that are too often overlooked in introductory materials. We wanted to bridge the gap between abstract concepts and real-world uses, showing how quantum algorithms and protocols can transform industries and redefine computational boundaries. Today, quantum computing is no longer confined to theoretical papers and academic circles. Leading organizations like IBM and Google already operate quantum machines, making it increasingly relevant for businesses and researchers across disciplines. Yet many still regard this technology as a distant, almost mythical concept. We hope this book changes that perception. By clearly presenting the mechanics and potential of quantum computing, we want to open this field to a wider audience, making it an integral part of both the study of computer science and the ongoing evolution of technology itself. The book is organized into 21 chapters grouped across three thematic sections that guide readers from foundational knowledge, through current advances, and toward future innovations in quantum computing. The first section, “The Past (Foundation),” explores the evolution and theoretical groundwork of quantum computing. It covers topics such as the basic principles of superposition, entanglement, and interference, foundational hardware, and early advances that shaped the field. Beginning with the Evolution of Quantum Computing and the Fundamentals of Quantum Computing, these chapters guide the reader from theoretical underpinnings to a systematic review of the literature and an examination of how Quantum Computing has evolved into a credible, experimental area of research. The second section, “The Current (Application),” delves into present-day advances, platforms, and uses of quantum computing across disciplines. Chapters in this section introduce critical frameworks and taxonomies for organizing quantum computing technologies, then move toward real-world deployments and applications. From quantum computing in transportation and agriculture to advances in quantum communication, quantum cryptography, quantum machine learning, and quantum homomorphic encryption for privacy-preserving analytics, these chapters reveal how quantum computing is reshaping industries and fields as diverse as telecommunications, healthcare, and cybersecurity. The final section, “The Future (Next-Generation Applications),” provides an indepth examination of the challenges and opportunities that will define quantum computing in the coming years. Here, chapters explore advances in quantum-enhanced AI, the role of quantum computing in securing 6G and beyond, its interplay with cutting-edge electronics and sensor design, and its ultimate role in a quantum internet. By addressing both the theoretical and experimental dimensions of future quantum computing applications, the book positions itself as an authoritative resource for researchers, educators, and practitioners seeking a roadmap for advances in quantum computing and its transformative potential across disciplines.