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Realizing an efficient fusion gate for W states with cross-Kerr nonlinearities and QD-cavity coupled system

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Abstract

We propose a new scheme for fusing two arbitrary-size photonic W states encoded by polarizations to generate a larger W state. With the help of cross-Kerr nonlinearities and a quantum dot in an optical cavity (QD-cavity coupled system), we can realize the fusion of W states with a high success probability. In addition, the scheme does not need any ancillary photon, and it can also be applied to fuse two Bell states. The scheme can be realized with current experimental technology.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11074002 and 61275119), by the Doctoral Foundation of the Ministry of Education of China (Grant No. 20103401110003), and also by the Natural Science Research Project of Education Department of Anhui Province of China (Grant Nos. KJ2013A205, KJ2011ZD07 and KJ2012Z309).

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  1. School of Physics and Material Science, Anhui University, Hefei, 230601, China

    Na Li, Jie Yang & Liu Ye

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  1. Na Li
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Correspondence to Liu Ye.

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Li, N., Yang, J. & Ye, L. Realizing an efficient fusion gate for W states with cross-Kerr nonlinearities and QD-cavity coupled system. Quantum Inf Process 14, 1933–1946 (2015). https://doi.org/10.1007/s11128-015-0977-1

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