Efficient three-step entanglement concentration for an arbitrary four-photon cluster state |
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| Authors: | Si Bin Su Shi-Lei Sun Li-Li Cheng Liu-Yong Wang Hong-Fu Zhang Shou |
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| Affiliation: | a Department of Physics, College of Science, Yanbian University, Yanji 133002, China;b Center for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China;c School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | We propose an entanglement concentration protocol (ECP) to concentrate an arbitrary partially-entangled four-photon cluster state. As a pioneering three-step entanglement concentration scheme, our protocol only needs single-photon resource to assist the concentration in each step, which makes this protocol more economical. With the help of the linear optical elements and weak cross-Kerr nonlinearity, one can obtain a maximally-entangled cluster state via local operations and classical communication. Moreover, the protocol can be iterated to obtain a higher success probability and is feasible under the current experimental conditions. |
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| Keywords: | cluster state entanglement concentration cross-Kerr nonlinearity |
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