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Two remote parties, Alice and Bob initially share some non-maximallyentangled states. Through the entanglement concentration by local operation andclassical communication(LOCC), they may obtain an outcome of maximallyentangled states in the price of decreasing the number of pairs shared by them.Recently, entanglement concentration have been experimently demonstrated bypost-selection (T. Yamamoto et al, Nature, 421, 343(2003) and Z. Zhao et al,quant-ph/0301118). Here we give a modified scheme which can be used for theentanglement concentration without any post selection by using only practicallyexisting linear optical devices. In particular, a sophisticated photon detectorto distinguish one photon or two photons is not required. Our scheme can beused to really produce the event-ready maximally entangled pairs through LOCCprovided that the requested raw pairs are supplied deterministically. Adetailed experimental plan with spontaneous parametric down conversion(SPDC) isshown.Comment: Published in Phys. Rev. A as a Rapid communication already. This  paper was orally reported in the 2nd Asia Pacific workshop of Quantum  Information Processing, SIngapore. Some related references are added. Some  related references are adde

Entanglement concentration by ordinary linear optical devices without postselection