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Efficient entanglement concentration for electron-spin W state with the charge detection

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Abstract

We present two entanglement concentration protocols (ECPs) for arbitrary three-electron W state based on their charges and spins. Different from other ECPs, with the help of the electronic polarization beam splitter and charge detection, the less-entangled W state can be concentrated into a maximally entangled state only with some single charge qubits. The second ECP is more optimal than the first one, for by constructing the complete parity check gate, the second ECP can be used repeatedly to further concentrate the less-entangled state and obtain a higher success probability. Therefore, both the ECPs especially the second one may be useful in current quantum information processing.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China under Grant no. 11104159, Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics Scientific, Tsinghua University, Open Research Fund Program of National Laboratory of Solid State Microstructures under Grant No. M25020 and M25022, A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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  1. College of Mathematics and Physics, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Lan Zhou

  2. Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Lan Zhou

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Correspondence to Lan Zhou.

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Zhou, L. Efficient entanglement concentration for electron-spin W state with the charge detection. Quantum Inf Process 12, 2087–2101 (2013). https://doi.org/10.1007/s11128-012-0511-7

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