Condensed Matter Physics Seminar

2 p.m., Thursday, December 2, 2004
Room 1201, Physics Building

 Silicon-based spin and charge quantum computation

Belita Koiller

(Instituto de Fisica - Universidade Federal do Rio de Janeiro - Brazil)

Abstract:  Proposed silicon-based quantum-computer architectures have attracted attention because of their promise for scalability and their potential for synergetically utilizing the available resources associated with the existing Si technology infrastructure. Electronic and nuclear spins of shallow donors (e.g. phosphorus) in Si are attractive candidates for qubits in such proposals, where shallow donor exchange gates are frequently invoked to perform two-qubit operations. An important potential problem in this context is that intervalley interference originating from the degeneracy in the Si conduction-band edge causes fast oscillations in donor exchange coupling, which imposes significant constraints on the Si quantum-computer architecture. We discuss possible ways to overcome this difficulty; in particular we analyze the feasibility of charge qubits in Si, focusing on single qubit properties in terms of tunnel coupling between the two phosphorus donors.
Host:  Kane
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