Quantum computer, as an emerging computational technology which cansurpass classical computers, evolves rapidly in recent years. Due to its greatscientific significance, as well as the strategic values in national economyand defence, development of quantum computer draws much attention togovernments, research institutes and multinational corporations in IT industry.The objective of thiscourse is to give a detailed and systematic introduction to the basic unit ofquantum computer hardware – the quantum bit (qubit). From this course, studentswill gain in-depth understanding of the properties, advantages, state of theart and experimental techniques of the various physical qubit implementations.