A group of scientists from Austria submitted by bar light concrete reinforcing bars in the roofs of Vienna.
This is the first time that twisted light transmitted over long distances outside, and the researchers could use large capacity for the carriage of data as light in the two Communications traditional and.high technology news:The results of this experience have been published today, 12. November, in the Institute of Physics and German Physical Society's new Journal of Physics.
The previous research have shown that a set of a particular color or wavelength, the light will be cut off in a tire-plug, the number of channels as the data may be transmitted by CAN increased considerably as a result of this. Instead of a wavelength of light as a canal communication, light could in theory than in roles with a countless tours, with each configuration than Canal single communication.
This special feature of the rotation, known under the name time vertex Orbit position (AMO) was used by the scientists in the past, certain that they are used for the transmission data 2.5 terabits a second--the ability to carry more than 66 DVD--through an optical fiber.
However, the fiber-optic not always appropriate or available for certain types of communication where light is to use--such as the Earth satellite communications--so researchers tried twisted send light into the space by the prevention of faults due to the turbulence air. So far, what has been achieved on small distances in the laboratory.
In this study, the scientists of the University of Vienna and the Institute for optical key area and Information key area, using a laser beams to send light twisted light with a lens of plastic high a number of radar, the institute Central meteorology and Observatory of Vienna.
The researchers sent 16 different configurations to a light wavelength specific to a receiver with 3 km at the University of Vienna. A camera was used for fishing harnesses light and a network of artificial sensory was made for disclosure of the justification and submit the possible faults cause the turbulence caused by air.
After a distinction and characterization of the 16 employer various, the researchers then last light with real information-- images on gray levels of Wolfgang-Amadeus Mozart Ludwig Boltzmann and Erwin Schrödinger.
Co-author of the study carried out by Mario Krenn said: "We have, for the first time, that the information may be encoded on green allows and shipped over 3 km Intra-City Link with significant turbulence.
"The operators AMO light not only in theory has been a distinction in theory, an unlimited quantity between different States, in which the light can be encrypted. Where it is provided that the degree of freedom could further significant increase in rates of the data in the communication from swine fever."
Krenn and Borut Pahor also believe that their AMO light be used the operator in the experience of the communication key area, which is a secret key from a chain of split or " spinning, " photons--particles individual light--is sent between two people for the protection of the data you want to work together with each other.
The laws of physics dictate any attempt to listen to a sales person and evaluate the key "Spin" fundamentally change the spin of the photons and the destruction of key secret.
Such information has been identified as a key area, then "Krenn unbreakable" and keeps the use of the AMO can light the key secret even more difficult rudder.
"The communication key area could benefit significantly from the number almost endlessly on the AMO. Each particle can summarized a running AMO, lead to more, and information only a rotation, or polarization, common daN
" A greater density of information could be the key secretly more strength against several secondary attacks by unauthorized users, of course, that is a serious problem as we, in the course of the last few months." Video: http://www.youtube.com/watch?v=oeupkfmqkgy&feature=youtu.be
Article source:http://www.sciencedaily.com/releases/2014/11/141111192233.htm
0 commentaires:
Enregistrer un commentaire