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Proceedings Paper

Quantum spin memories and dot lattice polaritons in planar microcavities
Author(s): Carlo Piermarocchi
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Paper Abstract

Proposals for quantum computers based on spin degrees of freedom require that individual qubits are placed close enough so to have a significant exchange interaction between them. We have found theoretically that mixed light-matter states (polaritons) in planar microcavities can give an extremely long range spin coupling. This implies that spin qubits can be located several hundreds of nanometers apart while still retaining control on pair interaction through the use of polaritons. This spin control scheme can be scaled to an array of qubits in a quantum dot lattice. We have theoretically investigated a lattice of identical quantum dots (or impurity states) coupled to two dimensional photon modes in a planar cavity. This geometry can be used to design polaritons with novel properties, based on the spatial modulation of the exciton wave function in the plane of the dots. The application of this structure to the realization of spin-qubit quantum memories will be discussed.

Paper Details

Date Published: 29 January 2008
PDF: 8 pages
Proc. SPIE 6903, Advanced Optical Concepts in Quantum Computing, Memory, and Communication, 69030K (29 January 2008); doi: 10.1117/12.772319
Show Author Affiliations
Carlo Piermarocchi, Michigan State Univ. (United States)

Published in SPIE Proceedings Vol. 6903:
Advanced Optical Concepts in Quantum Computing, Memory, and Communication
Zameer U. Hasan; Alan E. Craig; Philip R. Hemmer, Editor(s)

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