Two independent research teams recently reported successful demonstrations of working nuclear clocks, marking the transition of the concept from theory to reality. Unlike conventional atomic clocks, which keep time by measuring oscillations of electrons around an atom, nuclear clocks measure transitions occurring directly within the atomic nucleus itself.
This distinction is significant because atomic nuclei are far less sensitive to external disturbances such as electromagnetic fields, temperature fluctuations, and environmental noise. As a result, nuclear clocks could eventually surpass even the world's most precise atomic clocks.
The breakthrough centers on the isotope thorium-229, whose nucleus possesses a uniquely low energy transition that scientists have spent decades trying to access and measure. Successfully detecting and controlling this transition has been one of the biggest challenges in experimental physics.
Beyond improving timekeeping, nuclear clocks could enable entirely new scientific discoveries. Researchers believe they may help test fundamental laws of physics, search for dark matter, investigate whether physical constants change over time, and improve ultra precise navigation systems.
The achievement represents a major advance in humanity's ability to measure time and could ultimately lead to clocks so accurate that they would lose less than a second over periods far longer than the age of the universe.
-
source: arxiv