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Home NEWS Science News Chemistry

Time crystals “impossible” but obey quantum physics

Bioengineer by Bioengineer
June 2, 2022
in Chemistry
Reading Time: 2 mins read
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Rotating refrigerator
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Scientists have created the first ”time-crystal” two-body system in an experiment that seems to bend the laws of physics.

Rotating refrigerator

Credit: © Aalto University/Mikko Raskinen

Scientists have created the first ”time-crystal” two-body system in an experiment that seems to bend the laws of physics.

It comes after the same team recently witnessed the first interaction of the new phase of matter.

Time crystals were long believed to be impossible because they are made from atoms in never-ending motion. The discovery, published in Nature Communications, shows that not only can time crystals be created, but they have potential to be turned into useful devices.

Time crystals are different from a standard crystal – like metals or rocks – which is composed of atoms arranged in a regularly repeating pattern in space.

First theorised in 2012 by Nobel Laureate Frank Wilczek and identified in 2016, time crystals exhibit the bizarre property of being in constant, repeating motion in time despite no external input. Their atoms are constantly oscillating, spinning, or moving first in one direction, and then the other.

EPSRC Fellow Dr Samuli Autti, lead author from Lancaster University’s Department of Physics, explained: “Everybody knows that perpetual motion machines are impossible. However, in quantum physics perpetual motion is okay as long as we keep our eyes closed. By sneaking through this crack we can make time crystals.”

“It turns out putting two of them together works beautifully, even if time crystals should not exist in the first place. And we already know they also exist at room temperature.”

A ”two-level system” is a basic building block of a quantum computer. Time crystals could be used to build quantum devices that work at room temperature.

An international team of researchers from Lancaster University, Royal Holloway London, Landau Institute, and Aalto University in Helsinki observed time crystals by using Helium-3 which is a rare isotope of helium with one missing neutron. The experiment was carried out in Aalto University.

They cooled superfluid helium-3 to about one ten thousandth of a degree from absolute zero (0.0001K or -273.15°C). The researchers created two time crystals inside the superfluid, and brought them to touch. The scientists then watched the two time crystals interacting as described by quantum physics.



Journal

Nature Communications

DOI

10.1038/s41467-022-30783-w

Method of Research

Experimental study

Subject of Research

Not applicable

Article Title

Nonlinear two-level dynamics of quantum time crystals

Article Publication Date

2-Jun-2022

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