quantum soup noun4 •(informal) The quark-gluon plasma which existed in the first millionth of a second of the universe. •(informal) A Bose-Einstein condensate in which atoms cease to behave as separate entities at a temperature very close to absolute zero. •(informal) A vacuum in quantum chromodynamics where all elementary particles have a probability of appearing. •(informal) The linking of all matter and energy in the universe. formsquantum soups