BBC News - Ultracold science finds new method to get even colder: The team carefully adjusted the intensity of the crossed light beams. The trick was to do so in such a way that only the most energetic atoms in each lattice site absorbed energy from the light fields, becoming more energetic again.
By adjusting how frequently the light beam intensities were changed, the team was able to remove these "hottest" atoms from the system, leaving only the "coolest" ones behind.
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