Progress in quantum information and computing technologies requires efforts from physicists, chemists, computer scientists, mathematicians, and engineers. The Quantum Information and Computation IX conference will provide a forum for discussion among theoreticians and experimentalists from these disciplines, and others with interest in quantum technologies. Papers that report on new developments and breakthroughs in quantum information science, quantum communication, quantum cryptography, and quantum computing will be presented, as well as papers that employ non-locality.