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Hidden identification with invisible QR codes

01.09.2023

A team of researchers from the Massachusetts Institute of Technology has introduced an innovative identification system called BrightMarker, which has unique properties. These tags, visible only in the infrared spectrum, open up new horizons in secure tagging and tracking technology, which is considered more reliable than the widespread traditional QR codes popularized amid the global coronavirus pandemic.

The essence of the technology lies in the introduction of unique marks into objects during their production using special fluorescent threads. It is important to note that these labels have absolutely no effect on the characteristics and functionality of objects. To detect such tags, a number of hardware devices have been developed that are easily integrated with smartphones and virtual reality headsets.

The researchers believe BrightMarker technology has potential for a variety of applications. Invisible tags can authenticate items and track their movements, while still providing the functionality of regular QR codes. However, it is worth noting that BrightMarkers can only be applied to objects created using XNUMXD printing, which limits their scope.

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The physical theory of superconductivity is called into question 20.11.2019

Scientists at Stanford University have discovered a phenomenon in superconducting metals that has not yet been explained. It questions the current physical theory of superconductivity and requires quantum computers to describe it.

The researchers studied the transition phase in the Bi-2212 (Bi2Sr2CaCu2O8+x) superconductor using angular resolution photoelectron spectroscopy (ARPES). Intense ultraviolet light knocks electrons out of the sample, and the behavior of electrons in the metal is determined by the energy and speed of the particles.

Superconductivity is caused by electrons which, below a certain critical temperature, form Cooper pairs and can pass through the crystal unhindered. Above this limit, a "strange" phase appears in high-temperature superconductors, in which electrons do not behave as independent particles, as in ordinary metals, but seem to gather in collectives.

In addition to temperature, the degree of doping, that is, the presence of impurities in the metal, affects the phase transition. At a relatively high temperature, the transition between normal and "strange" metal occurs at an impurity content of 19-20 percent. The researchers showed that in this case, the distribution of electron energy changes abruptly. If the temperature is lowered to the superconducting phase, then the jump is smoothed out, and the properties begin to change gradually.

According to a physical principle called a quantum phase transition, this should not happen: a jumplike character should also occur at low temperatures. According to scientists, the phenomenon can be explained by quantum entanglement, and the behavior of particles can only be satisfactorily described using a quantum computer.

Superconductors are materials that conduct electricity with zero resistance. This phenomenon was first discovered at very low temperatures (a few degrees above absolute zero), but then superconductivity was achieved at higher temperatures (92 kelvin).

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