There are no complex codes for the light beam.
A breakthrough in the use of light in cryptography was made by researchers at the University of Michigan. A new way to decrypt allows hacking complex codes in just a few seconds. The method developed by scientists is based on the interaction of short pulses of coherent light flux with quantum dots. The whole salt of discovery is to use this property of light, according to which it forms a complex system at a certain frequency and phases, something like a kind of "optical network" that allows you to read information as you move from one quantum dot to another.
The device invented by North American scientists allows you to encrypt a ray of light according to a request (using something like a factorization of a number or a search for a numerical sequence). It is almost impossible to understand all this without special education, but the researchers have bothered to provide the public with a “simple” version. So, the beam of light is directed sequentially from one quantum dot to another, where there is a miscalculation of all possible options and combinations of answers for a given question. The results are read instantly (and the point itself, too), which allows you to get answers in a matter of seconds, while solving such a task would take more than a decade, even using the most powerful computers currently available.
The developed method is not only unique, but also relatively cheap. The fact is that as a source of light, researchers used inexpensive diodes. And since only one photon is needed for one bit of quantum information (qubit) (the energy expended on it is only 18 J), then the device requires only one billionth of a watt to operate at 1 GHz. While the operating frequency in laboratory conditions is 1.4 GHz, but scientists assume that the device can theoretically operate at a frequency of up to 100 GHz.
via TgDaily
The device invented by North American scientists allows you to encrypt a ray of light according to a request (using something like a factorization of a number or a search for a numerical sequence). It is almost impossible to understand all this without special education, but the researchers have bothered to provide the public with a “simple” version. So, the beam of light is directed sequentially from one quantum dot to another, where there is a miscalculation of all possible options and combinations of answers for a given question. The results are read instantly (and the point itself, too), which allows you to get answers in a matter of seconds, while solving such a task would take more than a decade, even using the most powerful computers currently available.
The developed method is not only unique, but also relatively cheap. The fact is that as a source of light, researchers used inexpensive diodes. And since only one photon is needed for one bit of quantum information (qubit) (the energy expended on it is only 18 J), then the device requires only one billionth of a watt to operate at 1 GHz. While the operating frequency in laboratory conditions is 1.4 GHz, but scientists assume that the device can theoretically operate at a frequency of up to 100 GHz.
via TgDaily
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Source: https://habr.com/ru/post/13468/
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