Can We Reach Absolute Zero?

04/08/11
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William Phillips

Nobel Prize-winning physicist William Phillips is a professor at the University of Maryland and leads the Laser Cooling and Trapping Group at the National Institute of Standards and Technology.

Absolute zero is the temperature at which entropy reaches its minimum value, and all energy has been taken out of a system. But is it reachable? Can anything ever be that cold? Nobel Prize-winning physicist William Phillips explains the daunting—possibly impossible—task of reaching the coldest temperature known.