Implementing concentration of unknown atomic entangled states via cavity decay
Zhuo‐Liang Cao · Journal of Atomic and Molecular Physics · 2007
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.