|Budget Amount *help
¥106,470,000 (Direct Cost: ¥81,900,000、Indirect Cost: ¥24,570,000)
Fiscal Year 2013: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2012: ¥24,310,000 (Direct Cost: ¥18,700,000、Indirect Cost: ¥5,610,000)
Fiscal Year 2011: ¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000)
Fiscal Year 2010: ¥34,320,000 (Direct Cost: ¥26,400,000、Indirect Cost: ¥7,920,000)
Fiscal Year 2009: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Among various physical systems, photons play a unique role as the only physical system that can be used as a carrier of quantum information in the communication between two remote parties. We have developed quantum interface to change the wavelength of the photons while preserving quantum properties of light and the quantum information it carries, and achieved a conversion fidelity over 90%. This interfeace is a vital tool for transmitting quantum information stored in various physical systems to a remote place through telecom fibers. We have also developed a very efficient method of protecting quantum information from noises in communication channels. Our experimental demonstration has shown that the new method achieves an efficency two orders of magunitude higher than the conventional method.