This state of matter was made in December 2003 by Deborah Jin and her group. Jin worked for the National Institute of Standards and Technology at the University of Colorado. Her team created this state of matter by cooling a cloud of potassium-40 atoms to less than a millionth°C over absolute zero (-273.15 °C, this is the hypothetical lowest limit of physical temperatures). This is the same temperature required to cool matter to a Bose–Einstein condensate. The process of cooling a gas into a condensate is called condensation.