Abstract
Logic qubit plays an important role in quantum computation. Recent research showed that logic qubit entanglement can be used in long-distance quantum communication. In this paper, we describe an entanglement purification protocol (EPP) for one type of logic qubit entanglement, named concatenated Greenberger–Horne–Zeilinger(C-GHZ) state. Not only the logic bit-flip and phase-flip errors in the C-GHZ state but also the single physical qubit bit-flip and phase-flip errors in the logic qubit can be purified. This EPP does not require the sophisticated controlled-not gate, but only requires some feasible linear optical elements, which is feasible in the current experimental condition.




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This work is supported by the National Natural Science Foundation of China under Grant Nos. 11474168 and 11747161.
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Wu, XD., Zhou, L., Zhong, W. et al. Purification of the concatenated Greenberger–Horne–Zeilinger state with linear optics. Quantum Inf Process 17, 255 (2018). https://doi.org/10.1007/s11128-018-2020-9
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DOI: https://doi.org/10.1007/s11128-018-2020-9