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Isotopically engineered silicon/silicon-germanium nanostructures as basic elements for a nuclear spin quantum computer

I Shlimak1, V I Safarov2 and I D Vagner3,4

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The idea of quantum computation is the most promising recent development in the high-tech domain, while experimental realization of a quantum computer poses a formidable challenge. Among the proposed models especially attractive are semiconductor based nuclear spin quantum computers (S-NSQCs), where nuclear spins are used as quantum bistable elements, `qubits', coupled to the electron spin and orbital dynamics. We propose here a scheme for implementation of basic elements for S-NSQCs which are realizable within achievements of the modern nanotechnology. These elements are expected to be based on a nuclear-spin-controlled isotopically engineered Si/SiGe heterojunction, because in these semiconductors one can vary the abundance of nuclear spins by engineering the isotopic composition. A specific device is suggested, which allows one to model the processes of recording, reading and information transfer on a quantum level using the technique of electrical detection of the magnetic state of nuclear spins. Improvement of this technique for a semiconductor system with a relatively small number of nuclei might be applied to the manipulation of nuclear spin `qubits' in the future S-NSQCs.


PACS

03.67.Lx Quantum computation architectures and implementations

81.07.-b Nanoscale materials and structures: fabrication and characterization

Subjects

Computational physics

Nanoscale science and low-D systems

Quantum information and quantum mechanics

Dates

Issue 26 (2 July 2001)

Received 14 February 2001, in final form 24 April 2001



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