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International Journal of Theoretical Physics

Deterministic Generation of W States for Any Number of Distant Atoms via Adiabatic Passage

Tianhui Qiu, Guojian Yang

Published Mar 5, 2013• 2 citations
Publisher
DOI
10.1007/s10773-013-1551-1

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We propose two schemes for generating Greenberger-Horne-Zeilinger and W states of three distant atoms. In the present schemes, the atoms are individually trapped in three spatially separated optical cavities coupled by two optical fibres. Performing an adiabatic passage along dark states, the population of cavities and fibres excited is negligible under certain conditions. In addition, the spontaneous decay of atoms is also efficiently suppressed based on our proposals. Furthermore, the discussion about the entanglement fidelity is given and we point out that our schemes work robustly with small fluctuations of experimental parameters.
A scheme is proposed for the generation of a two-atom entangled state and an N -atom W state in two distant cavities via adiabatic passage. In the scheme, since only laser fields applied to an atom need be changed, the property can effectively reduce the number of operations for implementing the scheme in experiment. And there are no excited states involved during the operation process, so the atom's spontaneous emission can be omitted approximately. Furthermore, the scheme is robust against the amplitude fluctuations of some experimental parameters.