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Journal of Anqing Teachers College

Preparation Scheme for Four—atom Entangled State via Cavity Decay

Zhu Cong-zhou

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

Preparation scheme for four—atomic entangled state via cavity decay is presented by interaction between A—atoms and cavity modes.When two single—photon detectors only detect two photons,which leaked out from the four cavities simultaneously respectively,four distant atoms will be created into a four—atom GHZ entangled state with a certain probability.

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Preparation scheme for four—atomic entangled state via cavity decay is presented by interaction between A—atoms and cavity modes.When two single—photon detectors only detect two photons,which leaked out from the four cavities simultaneously respectively,four distant atoms will be created into a four—atom GHZ entangled state with a certain probability.
We present a physical scheme to teleport an unknown atomic entangled state via cavity decay. In the teleportation process, four-particle Greenberger–Horne–Zeilinger (GHZ) state is used as quantum channel, and two unknown entangled atoms and two of four atoms in the four-particle GHZ state are trapped in four leaky cavities, respectively. Based on the joint detection of the photons leak out from the four cavities, we can teleport an unknown entangled state to two other remote atoms with certain probability and high fidelity.
A scheme for remote preparation of a two-atom entangled state is presented, which is based on the simultaneous nonresonant interaction of atoms with a single-mode cavity field. In view of the fact that two-particle entanglement is more easily generated than three-particle entanglement, the scheme prepares a two-atom entangled state via two pairs of two-atom entangled state as the quantum channel. Let two identical atoms Alice possesses interact with a single-mode cavity field simultaneously. Alice knows the state she wants to prepare. She selects a proper interaction time, measures the states of the atoms she possesses, and informs Bob of her measurement through a classical channel. Bob introduces an identical auxiliary atom and a single-mode cavity field in vacuum state to achieve the scheme. The scheme is insensitive to the cavity field states and cavity decay. The preparation can be achieved in a simple way. Based on current cavity quantum electrodynamics technique, the scheme can be realized experimentally.
We give the detailed study of a scheme to efficiently engineer multi-atom entanglement by detecting the cavity decay through single-photon detectors. The scheme can be used to prepare arbitrary superpositions of multi-atom Dicke states, without the requirements of high-efficiency detection, separate addressing of different atoms, and full localization of the atoms to the Lamb-Dicke limit. We analyze in detail various sources of noise and imperfections in this experimental scheme, and show that the scheme is robust to the dominant sources of noise and realizable with the state of the art technology.