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Journal of Physics B Atomic Molecular and Optical Physics

Entangled state generation via adiabatic passage in two distant cavities

Jie Song, Yan Xia, He‐Shan Song

Published Nov 13, 2007• 37 citations
Publisher

Abstract

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.

DOI
10.1088/0953-4075/40/23/010

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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.
A scheme is proposed to generate W state of N atoms trapped in a cavity, based on adiabatic passage along dark state. Taking advantage of adiabatic passage, the atoms have no probability of being excited and thus the atomic spontaneous emission is suppressed. The scheme is simple. It does not need to adjust the interaction time accurately, and does not need to prepare the cavity field in one-photon state. Numerical simulation shows that the successful probability of the scheme increases with the increasing of the atom number.
Schemes are presented for preparation for W state and high-dimensional entangled states of two atoms via adiabatic passage.In these schemes,since the quantum information is encoded in atomic ground states and the system always evolves in the dark state space so that there is no population in the atomic excited state,the atomic spontaneous emission is suppressed effectively.In addition,adiabatic passage insures that these schemes are robust to the fluctuation of the experimental parameter.Compared with previous proposals,our project saves effectively resources and can be experimentally realized more easily due to simpler operation.
A scheme is proposed to deterministically generate four-dimensional entangled states for two distant atoms trapped in two separate cavities via adiabatic passage by one step. An optimal expression of time-dependent Rabi frequencies is selected through numerical simulation. Numerical simulation also shows that the excited probabilities of the atoms, the cavity modes and the fiber modes are very low during adiabatic passage, and the scheme is insensitive to the fluctuation of experimental parameters. The four-dimensional entanglement may be generated with high fidelity with current experimental technology.