Abstract
We propose some schemes for implementing optimal symmetric (asymmetric) 1 → 2 universal quantum cloning, optimal symmetric (asymmetric) 1 → 2 phase-covariant cloning, optimal symmetric 1 → 3 economical phase-covariant cloning and optimal symmetric 1 → 3 economical real state cloning with spatially separated quantum dot spins by choosing the single-qubit rotation angles appropriately. The decoherences of the spontaneous emission of QDs, cavity decay and fiber loss are suppressed since the effective long-distance off-resonant interaction between two distant QDs is mediated by the vacuum fields of the fiber and cavity, and during the whole process no system is excited.
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Acknowledgments
This work is supported by the Scientific Research Fund for the Doctoral Program of Harbin University of Commerce under Grant No. 15KJ02; the National Natural Science Foundation of China under Grant Nos. 11264042, 11465020, 11165015 and 61465013; the Program for Chun Miao Excellent Talents of Jilin Provincial Department of Education under Grant No. 201316; and the Talent Program of Yanbian University of China under Grant No. 950010001.
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Wen, JJ., Yeon, KH., Du, X. et al. Implementing of Quantum Cloning with Spatially Separated Quantum Dot Spins. Int J Theor Phys 55, 3088–3096 (2016). https://doi.org/10.1007/s10773-016-2939-5
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DOI: https://doi.org/10.1007/s10773-016-2939-5