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29 January 2008 Quantum spin memories and dot lattice polaritons in planar microcavities
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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.
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Carlo Piermarocchi "Quantum spin memories and dot lattice polaritons in planar microcavities", Proc. SPIE 6903, Advanced Optical Concepts in Quantum Computing, Memory, and Communication, 69030K (29 January 2008);

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