Single-atom mirror for one-dimensional atomic lattice gases

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A. Micheli and P. Zoller
Institute for Theoretical Physics, University of Innsbruck, and Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria

Received 20 June 2005; revised 19 January 2006; published 20 April 2006

Wepropose a scheme utilizing quantum interference to control the transportof atoms in a one-dimensional optical lattice by a singleimpurity atom. The two internal state of the impurity representa spin-1/2 (qubit), which in one spin state is perfectlytransparent to the lattice gas, and in the other spinstate acts as a single atom mirror, confining the latticegas. This allows one to "amplify" the state of thequbit, and provides a single-shot quantum nondemolition measurement of thestate of the qubit. We derive exact analytical expression forthe scattering of a single atom by the impurity, andgive approximate expressions for the dynamics of a gas ofmany interacting bosonic or fermionic atoms.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.043613
DOI:	10.1103/PhysRevA.73.043613
PACS:	03.75.Lm; 42.50.-p; 03.67.Lx 03.75.Lm Josephson effect, tunneling, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations 42.50.-p Quantum optics 03.67.Lx Quantum computation YEAR: 2006
KEYWORDS:	fermion systems, boson systems, lattice gas, atom optics, quantum computing, quantum optics

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