Condensed Matter Physics Seminar

Semiconductor nanoelectronic devices can be combined, or integrated, in a variety of ways to control single electrons and form a qubit.  In a qubit, the quantum mechanical properties of a two-level system serve as the basic component of a quantum computer.  In our group, we have focused on silicon devices where electrons are confined by single donor atoms.   In this approach, the qubit is defined by the spin of a single electron.  Pulsed measurements are used for electrical readout and electron spin resonance for manipulation.  Using these techniques, we have measured long spin lifetimes, measured single shot spin readout and recently observed coherent oscillations of a single electron spin.  Devices for moving on to two-qubits will be discussed at the end of the talk.

Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.