ETH Zurich physicists have developed a semiconductor system that involved creating superimposed quantum dots that “trap” single electrons, which may be leveraged for supercomputing, Science Daily reports. Not only can these dots be studied with lasers, their energy can be influenced as well, a finding that brought the researchers one step closer to quantum computers, according to Science Daily. For the system, the Quantum Photonics Group researchers “grew” a gallium arsenide crystal and applied two layers of indium-gallium arsenide to it, which created tiny bubbles—the quantum dots. Writing in the journal Science, the lead author notes that “this kind of dot is like an artificial atom only bigger, and two superimposed dots constitute an artificial molecule.” Ultimately, the researchers successfully populated these quantum dots with single electrons and manipulated them with lasers. They also determined exactly how many electrons were present in one of their semiconductor system’s quantum dots. Moreover, they were able to imprison the charged particles in them individually (Science Daily, 5/23/08).