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International Journal of Quantum Information

CONCENTRATION FOR ATOMIC ENTANGLEMENT STATES VIA CAVITY DECAY

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

Published Oct 1, 2006• 1 citation
Publisher

Abstract

We present a physical scheme for entanglement concentration of atomic entangled states via cavity QED. In our scheme cavity decay and atomic spontaneous emission are taken into consideration, and the atomic qubit is used as stationary qubit and photonic qubit as flying qubit, thus it is more practical to discuss entanglement concentration.

DOI
10.1142/s0219749906002250

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We present a physical scheme for entanglement concentration of atomic entangled states via cavity QED. In our scheme cavity decay and atomic spontaneous emission are taken into consideration, and the atomic qubit is used as stationary qubit and photonic qubit as flying qubit, thus it is more practical to discuss entanglement concentration.
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.