Abstract
We have studied the standard quantum teleportation of an arbitrary single qubit state for the situation in which a two-qubit X-state as a resource successively passes through correlated quantum channels, including amplitude-damping, phase-damping, and depolarizing channels. Analytical expressions of full entangled fraction (which is related to fidelity of quantum teleportation) suffered from these noisy channels are presented. The results demonstrate that there is a threshold value \(\mu ^{\star }\), above which the source state even subjected to decoherence becomes useful for quantum teleportation. Besides, we also develop an effective strategy to enhance quantum teleportation fidelity under decoherence channels by means of filtering operation. The underlying physical mechanism of the enhancement of fidelity is also analyzed.
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Acknowledgements
This work is supported by the National Basic Research Program of China under Grant No. 2016YFA0301903, and the National Natural Science Foundation of China under Grants Nos. 11747107, 11174370, 11304387, 61632021, 11305262, 61205108 and 11574398, the Natural Science Foundation of Hunan Province (Grant No.2017JJ3346), the Project of Science and Technology Plan of Changsha (K1705022 and kc1809023), Scientific Research Project of Hunan Province Department of Education (19B060). Y. N. Guo is supported by the Program of Changsha Excellent Young Talents (kq1905005).
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Guo, Yn., Tian, Ql., Zeng, K. et al. Fidelity of quantum teleportation in correlated quantum channels. Quantum Inf Process 19, 182 (2020). https://doi.org/10.1007/s11128-020-02675-9
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DOI: https://doi.org/10.1007/s11128-020-02675-9