A fiber optic bandwidth record has been set. Free Technical Library News

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Fiber throughput record set

18.11.2022

Japanese scientists were able to set a new world record for the throughput of a single optical fiber.

The record was set by scientists from the Japanese National Institute of Information and Communication Technology.

They achieved a throughput of about 1,53 petabits per second (1 petabits is 1000 terabits). The achievement was made possible by encoding information at 55 different light frequencies (a technique known as multiplexing).

This bandwidth is enough to carry all of the world's Internet traffic over a single fiber optic cable.

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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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