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In this paper, we propose an optimal entanglement concentration protocol (ECP) for partially entangled cluster states with the help of the weak cross-Kerr nonlinearity. We can obtain the maximally entangled cluster states assisted with the projection measurements on the additional photons. The protocol is based on optical elements, single polarization photons, cross-Kerr nonlinearity, and the conventional photon detectors, which are feasible with existing experimental technology. Numerical simulation demonstrates that by iterating the entanglement concentration process $$n=m=6$$ n = m = 6 times, the ECP has the approximate maximal success probability 100 %. Moreover, the present protocol is also suitable for partially entangled $$4N$$ 4 N -photon cluster states concentration. All these advantages make this protocol more efficient and more convenient than others in the applications in quantum communication.
Quantum Information Processing – Springer Journals
Published: May 21, 2015
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