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Refined entanglement concentration for electron-spin entangled cluster states with quantum-dot spins in optical microcavities

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Abstract

We present a refined entanglement concentration protocol (ECP) for an arbitrary unknown less-entangled four-electron-spin cluster state by exploring the optical selection rules derived from the quantum-dot spins in one-sided optical microcavities. In our ECP, the parties obtain not only the four-electron-spin systems in the partial entanglement with two unknown parameters, but also the less-entangled two-electron-spin systems in the first step. Utilizing the above preserved systems as the resource for the second step of our ECP, the parties can obtain a standard cluster state by keeping the robust odd-parity instances with two parity-check gates. Meanwhile, the systems in the rest three instances can be used as the resource in the next round of our ECP. The success probability of our ECP is largely increased by iteration of the ECP process. Moreover, all the coefficients of our ECP are unknown for the parties without assistance of extra single electron-spin, so our ECP maybe has good applications in quantum communication network in the future.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China under Grant Nos. 11175094 and 91221205, and the National Basic Research Program of China under Grant No. 2015CB921002.

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  1. State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, China

    Fang-Fang Du & Gui-Lu Long

  2. Tsinghua National Laboratory of Information Science and Technology, Beijing, 100084, China

    Gui-Lu Long

  3. Collaborative Innovation Center of Quantum Matter, Beijing, 100084, China

    Gui-Lu Long

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Du, FF., Long, GL. Refined entanglement concentration for electron-spin entangled cluster states with quantum-dot spins in optical microcavities. Quantum Inf Process 16, 26 (2017). https://doi.org/10.1007/s11128-016-1496-4

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