This research center conducts an application of the new quantum cryptography to the cloud computing system as the next generation network. This new cryptography is based on so called Yuen-2000 (Y-00) protocol and the realization method has been discovered by Tamagawa University. The proto type of the system has been made in Hitachi Information & Communication Engineering and is using in the practical data center communication as the trial test. To establish this technology as the world wide standard, the security analysis and evaluation schemes in experiment are developed.