Scalable register initialization for quantum computing in an optical lattice

Details Scalable register initialization for quantum computing in an optical lattice Scalable register initialization for quantum computing in an optical lattice

2003-12-08

arxiv.org/abs/quant-ph/0312069v1

Journal of Physics B 38, 1687 (2005).

Physics

Quantum Physics

5 pages, 2 figures

Scientific paper

10.1088/0953-4075/38/11/010

The Mott insulator state created by loading an atomic Bose-Einstein condensate (BEC) into an optical lattice may be used as a means to prepare a register of atomic qubits in a quantum computer. Such architecture requires a lattice commensurately filled with atoms, which corresponds to the insulator state only in the limit of zero inter-well tunneling. We show that a lattice with spatial inhomogeneity created by a quadratic magnetic trapping potential can be used to isolate a subspace in the center which is impervious to hole-hoping. Components of the wavefunction with more than one atom in any well can be projected out by selective measurement on a molecular photo-associative transition. Maintaining the molecular coupling induces a quantum Zeno effect that can sustain a commensurately filled register for the duration of a quantum computation.

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