The decoherence of quantum entanglement and teleportation in Bell-diagonal states

  • We study the dynamics of entanglement and teleportation in Bell-diagonal states. Using the concepts of concurrence and fidelity, the analytical expressions of the entanglement, the output entanglement and the average fidelity with decoherence are obtained for this model. We discover a class of initial states in which the output entanglement and the average fidelity are destroyed by decoherence. The quality of teleportation depends on the system parameters and time.
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  • [1] Fanchini F F, Castelano L K, Caldeira A O. New J. Phys.,2010, 12: 0730092 LI M, FEI S M, LI-JOST X Q. Chin. Sci. Bull., 2011,56(10): 945-9543 GUO Y, QI X F, HOU J C. Chin. Sci. Bull., 2011, 56(9):840-8464 Terhal B M. Theoretical Computer Science, 2002, 287:313-3355 Shamsolah S, Shahram M. Chin. Sci. Bull., 2011, 56(7):618-6256 Bennett C H, Brassard G. Proceedings of IEEE International Conference on Computers Systems and Signal Processing, 1984. 175-1797 DENG F G, LONG G L. Phys. Rev. A, 2004, 69: 0523198 LONG G L, LIU X S. Phys. Rev. A, 2002, 65: 0323029 HAN F. Chin. Sci. Bull., 2010, 55(17): 1758-176210 AI Q, WANG Y D, LONG G L, SUN C P. Science in China Series G, 2009, 52(12): 1898-190511 QIN M, LI Y B. Chin. Phys. C (HEP NP), 2010, 34(4):448-45112 ZHANG G. F. Phys. Rev. A, 2007, 75: 03430413 Kheirandish F, Akhtarshenas S J, Mohammadi H. Phys. Rev. A, 2008, 77: 04230914 GUO J L, SONG H S. Eur. Phys. J. D, 2010, 56: 265-26915 LANG M D, Caves C M. Phys. Rev. Lett., 2010, 105:15050116 Mazzola L, Piilo J, Maniscalco A. Phys. Rev. Lett., 2010,104: 20040117 WANG Z J, ZHANG K. Commun. Theor. Phys., 2009, 52:83218 Wotters W. K. Phys. Rev. Lett., 1998, 80: 224519 Lee J, Kim M S. Phys. Rev. Lett., 2000, 84: 423620 Bowen G, Bose S. Phys. Rev. Lett., 2001, 87: 26790121 Jozsa R. J. Mod. Opt., 1994, 41: 31522 CAI J T, ABLIZ A, ZHANG G F. Opt. Commun, 2010,283: 4415
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QIN Meng, LI Yan-Biao, WANG Xiao and BAI Zhong. The decoherence of quantum entanglement and teleportation in Bell-diagonal states[J]. Chinese Physics C, 2012, 36(4): 307-310. doi: 10.1088/1674-1137/36/4/002
QIN Meng, LI Yan-Biao, WANG Xiao and BAI Zhong. The decoherence of quantum entanglement and teleportation in Bell-diagonal states[J]. Chinese Physics C, 2012, 36(4): 307-310.  doi: 10.1088/1674-1137/36/4/002 shu
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Received: 2011-07-19
Revised: 2011-09-21
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The decoherence of quantum entanglement and teleportation in Bell-diagonal states

Abstract: We study the dynamics of entanglement and teleportation in Bell-diagonal states. Using the concepts of concurrence and fidelity, the analytical expressions of the entanglement, the output entanglement and the average fidelity with decoherence are obtained for this model. We discover a class of initial states in which the output entanglement and the average fidelity are destroyed by decoherence. The quality of teleportation depends on the system parameters and time.

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