An Efficient Scheme for Entanglement Concentration of Arbitrary Four-Photon States |
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Authors: | Ting-Ting Xu Wei Xiong Liu Ye |
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Institution: | 1. School of Physics and Material Science, Anhui University, Hefei, 230039, China 2. Dept. Phys. State Key Lab Surface Phys., Fudan University, Shanghai, 200433, China
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Abstract: | The maximally entanglement will become less-entangled state because of the effects of decoherence. However, maximally entangled states are usually important for most of the quantum information processing protocols. So we propose a practical entanglement concentration protocol of an arbitrary four-photon less-entangled state assisted with single photons, which greatly reduces the difficulty of the experimental realization. In our scheme, we only employ three steps, a four-photon cluster state can be acquired with a certain probability by three affiliated photons. The protocol adopts the linear optical elements and weak cross-Kerr media, which make the scheme more simple and feasible in the experiment. |
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