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Tag archives: ultracold atoms

Where is the coldest experiment on Earth?

Image of a refocused cloud of rubidium atoms

Chilly peak: a refocused cloud of rubidium atoms. (Courtesy: Tim Kovachy et al./Physical Review Letters)

By Hamish Johnston

California might be suffering a punishing drought, but a tiny corner of the Golden State is now the coldest place on Earth. This tiny super-cold patch was created at Stanford University by Mark Kasevich and colleagues, who have used “matter-wave lensing” to cool a cloud of about 100,000 rubidium atoms to less than 50 pK. That is just 50 × 10–12 degrees kelvin above absolute zero.

The temperature of a cloud of atoms is defined by the average velocity of the atoms as they drift about. Kasevich’s team used a series of lenses to reduce this average motion to less than 70 µm/s, which corresponds to 50 pK. This shatters the previous record of 1 nK for matter-wave lensing and represents “record-low kinetic temperatures” according to Physical Review Letters, where the research is described.

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Celebrating Louis Essen and the birth of atomic time

Peter Knight (left) and John Dudley unveiling the historical plaque

Peter Knight (left) and John Dudley unveiling the historic plaque.

By Hamish Johnston

On Friday I braved the torrential rains that have been soaking southern England to make the journey from Bristol to Teddington, which is the birthplace of the atomic clock. Situated in the leafy suburbs west of London on the swollen banks of the River Thames, Teddington is the home of the National Physical Laboratory (NPL), which is the UK’s standards and metrology lab.

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