It has to do with something called "atomic excitation." From the article (emphasis added): When photons pass through a medium ...

Researchers are exploring multi-level atomic interactions to enhance quantum entanglement. Using metastable states in ...

For the last seven years, the study authors have been studying atomic excitation, a phenomenon that occurs as a result of interaction between light and matter. During atomic excitation ...

Kelvin waves have been a mystery for decades but a new method involving superfluid helium-4 can help us control them.

By utilizing a doughnut-shaped optical vortex beam and a traveling wave Stokes laser beam, researchers can create a highly confined atomic excitation, resulting in a nanometer-scale atomic spot.

Recent studies have employed sophisticated computational methods to explore atomic properties, excitation energies, and transition rates, providing valuable insights into the fundamental physics ...

Their work focuses on how light interacts with matter, particularly atomic excitation. In this process, photons energise atoms, causing electrons to jump to higher states. When electrons return ...