Book excerpt: Quantum Materials, Devices, and Applications covers the advances made in quantum technologies, both in research and mass production for applications in electronics, photonics, sensing, biomedical, environmental and agricultural applications. The book includes new materials, new device structures that are commercially available, and many more at the advanced research stage. It reviews the most relevant, current and emerging materials and device structures, organized by key applications and covers existing devices, technologies and future possibilities within a common framework of high-performance quantum devices. This book will be ideal for researchers and practitioners in academia, industry and those in materials science and engineering, electrical engineering and physics disciplines. Comprehensively covers the important and rapidly growing area of quantum technologies by focusing on current and emerging materials, devices and applications Takes an applied approach to the topic by addressing key applications in electronics, optoelectronics, photonics, sensing and the environment Addresses ethical considerations, remaining challenges and future opportunities for quantum materials and devices