Fluorescence image of a single trapped Sr+ ion immersed in a cloud of 100,000 trapped Rb atoms. The ion is trapped by radio-frequency fields. The atoms are trapped by a focused laser-beam. Both species are cooled to a temperature of a millionth of a degree Kelvin above absolute zero temperature

Weizmann (Israel): One ion and thousands of atoms, all at a millionth of a degree above absolute zero

At the very lowest temperatures, electricity and “superfluids” flow without resistance, and other weird quantum phenomena appear. Scientists can now cool matter down to...

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