 Daniel Loss

Daniel Loss and David P. DiVincenzo proposed quantum computation with the spins of single electrons confined in coupled quantum dots. Changing an electrical barrier changes tunnelling between the quantum dots and hence the exchange interaction between their spins. Controlling this interaction supplies two-qubit operations, while local spin control supplies single-qubit operations. The proposal makes a semiconductor device a controllable interacting quantum system, and explicitly considers how unwanted coupling to the environment degrades the operations.^[ref]