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Summary form only given. The preparation of quantum systems in pure states is a prerequisite for coherent control. In this context laser cooling of trapped particles to the ground state of the confining potential is a powerful tool for preparing e.g. ions for quantum logic. In particular sideband cooling has been demonstrated to be the most efficient technique, allowing to achieve more than 99% of...
Summary form only given. Controlled interactions between pairs of neutral atoms in optical lattices allow for the creation of highly entangled multiparticle states and the implementation of quantum logic gates. Such systems benefit from suppressed decoherence because neutrals couple weakly to the environment and from the possibility of processing with the massively parallel quantum registers in the...
Summary form only given. Standing wave laser fields produce a periodic potential for atoms, which can trap cold atoms in an ordered crystal-like structure to form an optical lattice. Optical lattices have been used as model systems in studies of quantum dynamical effects and quantum state control. More recently, it has been suggested that such lattices would provide an attractive system for performing...
Summary form only given. A chain of ions in a linear trap is ideally suited to process quantum information. Two long-lived internal states in each ion store the quantum bits, which may be coupled by means of the collective vibrational excitation of the chain. A prerequisite for realizing even the simplest two-bit quantum gate is cooling the vibrational degrees of freedom of the ion crystal to the...
Summary form only given. Nonlinear optical effects at the two-photon level are usually negligible because of the weak electric field associated with a single photon. In addition, conventional mechanisms for the production of nonlinear phase shifts require both photons to interact with the same atom, which is unlikely to occur in an ordinary medium containing a large number of atoms. Although nonlinear...
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