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.
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Host: Kane
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