Traditional coding technologies for information transfer use the binary system. However, even now evolving methods of quantum information transfer are also based on system data with two variables. Although the methods of multidimensional quantum coding «can do more». And it is theoretically possible four-dimensional coding for the first time not long ago passed a series of tests.
The New development allows each photon to carry one of four values — 00, 01, 10 and 11. The use of the so-called quantum 4D-coding allows to increase the amount of information to be transmitted several times, and the data have a much higher level of security from data interception and other external factors.
Until recently, the technology of quantum 4D-coding was implemented only in the form of small models, but experts from the University of Ottawa had a successful first real test. Information transfer is carried out between the base stations located on the roofs of tall buildings at a distance of 300 meters from each other.
Both plants were placed inside wooden boxes to protect them from bad weather conditions. The error rate in the transmission of data was 11%, far below the level required for secure quantum communication channel. The system could transmit 1.6 times more information than the system «common» quantum coding. As stated by lead researcher Ibrahim Karimi,
«Our experiment became the world's first transmission of data, conducted with the help of technology dimensional quantum encoding in real urban environments. Demonstration of a quantum communication system, working outdoors, able to communicate with satellites in orbit and places on the Earth's surface, where it is impractical to lay fiber. Such a system can serve to organize secure communication with moving objects such as aircraft and ships. In the future we plan to increase the distance of 5.6 kilometers, using the middle station and the adaptive optics system that will compensate for all the distortions introduced by the atmosphere».
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