Quantum Computing Devices: Principles, Designs, and Analysis

This book provides a comprehensive treatment of the physical foundations, design, and analysis of quantum computing devices, with a particular focus on the relationship between quantum mechanical principles and the physical implementation of quantum processors. The authors begin by examining the foundations of quantum information and computation, the structure of quantum systems, the operating principles of qubits, and quantum logical operations. They also address imperfect quantum operations and the effects of errors and decoherence, establishing the necessary background for understanding the limitations and requirements of practical quantum computer implementation. The main part of the book is devoted to the examination and analysis of different technologies for building quantum computing devices. These include ion traps, cavity quantum electrodynamics (Cavity QED), confined neutral atoms, quantum dots, linear optical quantum computing, superconducting circuits, and nuclear magnetic resonance (NMR). For each technology, the book investigates the physical properties of the system, qubit initialization and control methods, the implementation of quantum gates, measurement mechanisms, and the factors affecting the preservation or loss of coherence. This structure enables readers to compare different hardware approaches in terms of their underlying physical principles and implementation capabilities. An important feature of the book is its simultaneous treatment of theoretical foundations and practical aspects of quantum device design. The authors demonstrate how different physical systems can serve as platforms for implementing quantum gates and processing quantum information. Through mathematical models, physical analyses, diagrams, and design examples, the book clarifies the relationship between the physical behavior of quantum systems and their computational performance. It serves as a specialized reference for understanding different quantum hardware technologies, analyzing their characteristics and limitations, and exploring the engineering challenges involved in building quantum computers.