29 November 2011 Nature Physics News&Views

Three spin coherent manipulation.

Frank Koppens reviews new advances in quantum communication with three quantum dots. Prof. Frank Koppens, leader at ICFO of the Nano-optoelectronic group, reviews in Quantum technology: Three-spin juggling a new proposal in spin-based quantum computing recently presented in Nature Physics by researchers of the Institute for Microstructural Sciences-NRCC and Université de Sherbrooke (Canada) led by Dr. Louis Gaudreau and Prof. Andy Sachrajda.

The experiment of Gaudreau and collaborators on coherent control of three-spin states in a triple quantum dot is considered by Koppens as demonstrating “the potential for scalability of a spin-based quantum computer” so that “now nothing is holding us back from building an all-electrically controlled quantum chip made up of large numbers of electron spins”.