Exchange-free communication

Charles H. Bennett

Praveen Gorla

In general, signal(s) travel form Transmitting Node (Tx) to the Receiving Node (Rx), as most of us knows. What if two signals (One Signal from Tx and other Signal form Rx ) interact in the Free-Space and exchange the information in free space rather than processing the information at the systems ends. This generally reduces the complexity of present day systems. As the information is exchanged and/or communicated between signals in space(Free Space). System resources can be used for other purpose, such as to analyze the information and to increase its graphical interface. In-fact space signal communication would greatly increases the speed of communication. About 20% - 30% of time is saved in exchanging/processing the information between two nodes when compared with the existing system.

Praveen Gorla

In general, signal(s) travel form Transmitting Node (Tx) to the Receiving Node (Rx), as most of us knows. What if two signals (One Signal from Tx and other Signal form Rx ) interact in the Free-Space and exchange the information in free space rather than processing the information at the systems ends. This generally reduces the complexity of present day systems. As the information is exchanged and/or communicated between signals in space(Free Space). System resources can be used for other purpose, such as to analyze the information and to increase its graphical interface. In-fact space signal communication would greatly increases the speed of communication. About 20% - 30% of time is saved in exchanging/processing the information between two nodes when compared with the existing system.

Jiang Zhang, Zhenfeng Zhang

M. S. Godfrey, A. M. Lynch, J. L. Duligall +3 more

Coding data bits in the phase or polarisation state of light allows us to exploit the wave particle duality for novel communication protocols. Using this principle the first practical quantum communication systems have been built. These are the fibre and free-space quantum cryptography apparatus used for secure exchange of keys. To date free space key exchange has aimed at long range with 144km range achieved and future experiments aiming to extend this range to 1000km exchanging keys with low earth orbit satellites. At the other end of the spectrum we are developing low cost hand held systems. These systems could be an effective way for the user to generate a store of secrets shared with a central repository. These secrets can then be used up to protect a wide variety of sensitive classical communications. Examples include on-line PIN protection for consumer transactions and password protection in secure access schemes.