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Chinese Physics

Scheme for concentration of the unknown GHZ entangled states

Zhang Gang, Yang Ming, Zheng‐Yuan Xue, Zhuo‐Liang Cao

Published May 1, 2006• 14 citations
Publisher

Abstract

We propose two schemes for concentrating unknown nonmaximally tripartite GHZ entangled states via cavity quantum electrodynamics (QED) techniques. The finial pure states obtained from the two schemes are shared by two or three parties. Our schemes only require large-detuned interaction between two driven atoms and the quantized cavity mode, which is insensitive to both the cavity decay and thermal field, thus the schemes are well within current experimental technology.

DOI
10.1088/1009-1963/15/5/009

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We propose two schemes for concentrating unknown nonmaximally tripartite GHZ entangled states via cavity quantum electrodynamics (QED) techniques. The finial pure states obtained from the two schemes are shared by two or three parties. Our schemes only require large-detuned interaction between two driven atoms and the quantized cavity mode, which is insensitive to both the cavity decay and thermal field, thus the schemes are well within current experimental technology.
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A scheme for the distant transfer of a qubit atomic state and atomic entangled states are presented.In the scheme,the identical two-level atoms interact simultaneously with a highly detuned cavity mode and are driven by a strong classical field,and the atomic state evolution is independent of cavity field state.Thus the scheme is insensitive to both the cavity decay and the thermal field and the requirement on the quality factor of the cavity is greatly loosened, which is of importance from the experimental point of view.
We present a physical scheme for entanglement concentration of unknown atomic entangled states via cavity decay.In the scheme,each of the atoms is a three-level system,which has two ground states(｜g〉,｜e〉),and an excited state(｜r〉),the atomic state is used as stationary qubit and photonic state as flying qubit.There are two nonmaximally entangled atom-pairs,one atom of every atom-pairs are capped in two leaked cavity,respectively.In the case of large detuning and the upper level ｜r〉 can be decoupled from the evolution during the interaction,applying classical laser pulses on the capped atoms and by detecting the photons leaked from the cavities,a close maximally entangled state can be obtained from the two pairs of partially atomic entangled states probabilistically.Our scheme is practical and the remote entangled states concentration via high quality fiber will be convenient.