Quantum Computing/Information Processing

The primary goal is to identify the most suitable physical system/implementation for quantum computing/information processing and analyze/design the optimum structure. Our proposed design is based on a linear array of quantum dots that are defined by metal electrodes on silicon with voltage applied so that a single electron is trapped at each quantum dot at low temperature. Placed in an external magnetic field, the Zeeman spin states of these electrons constitute the qubits of the quantum computer. The proximity of the quantum dots assures exchange coupling between electron spins (qubits) on neighboring dots. To explore the feasibility of this structure, we are pursuing the following issues: (1) development and use of 3D models to explore design of optimum/robust QD (i.e., qubit) structures as well as the spin-SET detector, (2) description for the generation of the dynamic electric and magnetic fields for address operation, and (3) investigation of mechanisms for the loss of spin coherence.

ECE Nano Image - Cross section of two QDs

Our embodiment of a nanoscale quantum information system (QIS), illustrated in Figure 1, relies on trapping a single electron within each quantum dot (QD) of a linear array of quantum dots and has the following attributes: