13,766 research outputs found
Implementation of multi-walker quantum walks with cavity grid
We show how multi-walker quantum walks can be implemented in a quantum
quincunx created via cavity quantum electrodynamics. The implementation of a
quantum walk with a multi-walker opens up the interesting possibility to
introduce entanglement and more advanced walks. With different coin tosses and
initial states the multi-walker quantum walk shows different probability
distributions which deviate strongly from the classical random walks with
quadratic enhanced spreadings and localization effects. By introducing
decoherence, the transition from quantum walks to the classical versions is
observed. We introduce the average fidelity decay as a signature to investigate
the decoherence-induced irreversibility of quantum walks.Comment: 7 pages, 3 figure
Scheme for preparation of mulipartite entanglement of atomic ensembles
We describe an experimental scheme of preparing multipartite W class of
maximally entangled states between many atomic ensembles. The scheme is based
on laser manipulation of atomic ensembles and single-photon detection, and well
fits the status of the current experimental technology. In addition, we show
one of the applications of the kind of W class states, teleporting an entangled
state of atomic ensembles with unknown coefficients to more than one distant
parties, either one of which equally likely receives the transmitted state.Comment: 4 pages, 3 figure
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