Quantum Information Processing in Optical Lattices and Magnetic Microtraps
arXiv:quant-ph/0605163 · doi:10.1002/prop.200610325
Abstract
We review our experiments on quantum information processing with neutral atoms in optical lattices and magnetic microtraps. Atoms in an optical lattice in the Mott insulator regime serve as a large qubit register. A spin-dependent lattice is used to split and delocalize the atomic wave functions in a controlled and coherent way over a defined number of lattice sites. This is used to experimentally demonstrate a massively parallel quantum gate array, which allows the creation of a highly entangled many-body cluster state through coherent collisions between atoms on neighbouring lattice sites. In magnetic microtraps on an atom chip, we demonstrate coherent manipulation of atomic qubit states and measure coherence lifetimes exceeding one second at micron-distance from the chip surface. We show that microwave near-fields on the chip can be used to create state-dependent potentials for the implementation of a quantum controlled phase gate with these robust qubit states. For single atom detection and preparation, we have developed high finesse fiber Fabry-Perot cavities and integrated them on the atom chip. We present an experiment in which we detected a very small number of cold atoms magnetically trapped in the cavity using the atom chip.
15 pages, 11 figures, corrected author list
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- Visibility of Cold Atomic Gases in Optical Lattices for Finite Temperatures
- Enhancement of Quantum Correlation Length in Quenched Disordered Spin Chains
- Ultra-cold mechanical resonators coupled to atoms in an optical lattice
- Dynamical quantum correlations after sudden quenches
- Static and dynamical quantum correlations in phases of an alternating field XY model
- "Magic" radio-frequency dressing for trapped atomic microwave clocks
- Cavity QED with Multiple Hyperfine Levels
- Cluster State Generation with Spin-Orbit Coupled Fermionic Atoms in Optical Lattices
- Speeding up the spatial adiabatic passage of matter waves in optical microtraps by optimal control
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- Interatomic interaction effects on second-order momentum correlations and Hong-Ou-Mandel interference of double-well-trapped ultracold fermionic atoms
- Thermal Fluctuations Enhance Order-from-Disorder of Quantum Correlations in Quenched Disordered Spin Models
- Constructive Interference Between Disordered Couplings Enhances Multiparty Entanglement in Quantum Heisenberg Spin Glass Models
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- Scalable Neutral Atom Quantum Computer with Interaction on Demand: Proposal for Selective Application of Two-Qubit Gate
- Production of mesoscopic superpositions with ultracold atoms
- Quantum feedback control of atomic ensembles and spinor Bose-Einstein condensates
- Localizing genuine multiparty entanglement in noisy stabilizer states
- Dynamical stability of entanglement between spin ensembles
- Logarithmic growth of peripheral entanglement concentrated via noisy measurements in a star network of spins