Quantum cryptographic key distribution
Secret communications where a sender and receiver can safely share a private key by taking advantage of quantum mechanics. One of the characteristics of quantum mechanics is that it can make the act of eavesdropping detectable, allowing for a key distribution method that has absolute physical security.
 Single-photon emitter
A light source capable of emitting a string of pulses that are each a single photon. This can be achieved by quantum dots, atoms, or ions with discrete energy levels, but only quantum dots can achieve wavelengths suited to communications at present. The ideal is the ability to never emit two or more photons per pulse, nor to emit zero photons.
 Quantum dot
A grain-like structure measuring several tens of nanometers in size that can confine an electron in three dimensions. When an electron is confined in this nanocrystal, the electron density of states is completely discrete. This has previously been applied to lasers, optical amplifiers, and single-photon emitters. In 1982, Professors Yasuhiko Arakawa and Hiroyuki Sakaki put forward the general concept of quantum dots.
 Time-bin coding optical transmissions
An encoding method for quantum states using single photons. Measures the difference in a single photon's phase (timing) with an optical interferometer. Tolerant of disturbances on the transmission path, this encoding method is designed for single-photon quantum cryptographic transmissions in practical use.
The University of Tokyo was established in 1877 as the first national university in Japan. As a leading research university, the University of Tokyo offers courses in essentially all academic disciplines at both undergraduate and graduate levels and conducts research across the full spectrum of academic activity. The university aims to provide its students with a rich and varied academic environment that ensures opportunities for both intellectual development and the acquisition of professional knowledge and skills.
The University of Tokyo is known for the excellence of its faculty and students and ever since its foundation many of its graduates have gone on to become leaders in government, business, and the academic world. For more information, please see: http://www.u-tokyo.ac.jp/index_e.html.
Founded in 1968 as a wholly owned subsidiary of Fujitsu Limited, Fujitsu Laboratories Limited is one of the premier research centers in the world. With a global network of laboratories in Japan, China, the United States and Europe, the organization conducts a wide range of basic and applied research in the areas of Next-generation Services, Computer Servers, Networks, Electronic Devices and Advanced Materials. For more information, please see: http://jp.fujitsu.com/labs/en.
NEC Corporation is a leader in the integration of IT and network technologies that benefit businesses and people around the world. By providing a combination of products and solutions that cross utilize the company's experience and global resources, NEC's advanced technologies meet the complex and ever-changing needs of its customers. NEC brings more than 100 years of expertise in technological innovation to empower people, businesses and society. For more information, visit NEC at http://www.nec.com.
Press ContactsDr. Yasuhiko Arakawa
Company:The University of Tokyo
Technical ContactsDr. Yasuhiko Arakawa
Company:The University of Tokyo
Company, organization, and product names mentioned herein are trademarks or registered trademarks of their respective owners. Information provided in this press release is accurate at time of publication and is subject to change without advance notice.
Date: 10 September, 2010
City: Tokyo and Kawasaki
Company: University of Tokyo, Fujitsu Laboratories Ltd., NEC Corporation, , ,
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