Definition of "ultracold" []

• Of a temperature close to absolute zero, especially one at which quantum-mechanical properties are observed. (adjective)
• Extremely cold. (adjective)

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• "Physicists at the Joint Quantum Institute (JQI) of the National Institute of Standards and Technology (NIST) and the University of Maryland have proposed a recipe for turning ultracold “boson” atoms — the ingredients of Bose-Einstein condensates — into a “supersolid,” an exotic state of matter that behaves simultaneously as a solid and a friction-free superfluid."
• "A new method has been developed to directly and precisely measure a quantum property of individual atoms -- the phase shifts that result when they collide at ultracold temperatures -- in a way that is independent of the accuracy-limiting density of the atoms."
• "It is pretty easy to do a poll perhaps not well..., it is pretty hard to to ultracold STM of atomic junctions."