研究了2-qubit量子系统在退极化噪声作用下的一些纠缠特性.通过对ansatz态纠缠演化的分析,给出了纠缠和纠缠鲁棒性的解析关系.此外纠缠猝死时间在很大程度上取决于量子态的纠缠和鲁棒性.对于纯态,纠缠鲁棒性完全取决于纠缠;但是混态将会复杂许多,其鲁棒性除了受自身纠缠的影响以外,还会受到其他纠缠度的影响.
[1] NIELSEN M A, CHUANG I L, 郑大钟, 赵千川. 量子计算和量子信息 [M]. {H}北京:清华大学出版社 2005.
[2] BENNETT C, BRASSARD G, CREPEAU C. Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels [J]. {H}Physical Review Letters 1993, 70.
[3] Grover LK. Quantum mechanics helps in searching for a needle in a haystack [J]. Physical review letters 1997, 2(2).
[4] BENNETT C H, WIESNER S J. Communication via one-and two-particle operators on Einstein-Podolsky-Rosen states [J]. {H}Physical Review Letters 1992, 69.
[5] EKERT A K. Quantum cryptography based on Bell's theorem [J]. {H}Physical Review Letters 1991, 67.
[6] YU T, EBERLY J H. Finite-time disentanglement via spontaneous emission [J]. {H}Physical Review Letters 2004, 93.
[7] ALMEIDA M P, MELO F D, HOR-MEYLL M. Environment-induced sudden death of entanglement [J]. {H}SCIENCE 2007, 316.
[8] Vidal G., Tarrach R.. Robustness of entanglement [J]. Physical Review, A 1999, 1(1).
[9] SIMON C, KEMPE J. Robustness of multiparty entanglement [J]. {H}Physical Review A 2002, 65.
[10] ZHAO Baokui, DENG Fuguo. Residual effect on the robustness of multiqubit entanglement [J]. {H}Physical Review A 2010, 82.
[11] Borras A, Majtey AP, Plastino AR, Casas M, Plastino A. Robustness of highly entangled multiqubit states under decoherence [J]. Physical Review, A 2009, 2 Pt.a(2 Pt.a).
[12] DüR W, BRIEGEL H. Stability of macroscopic entanglement under decoherence [J]. {H}Physical Review Letters 2004, 92.
[13] Hill S, Wootters WK. Entanglement of a pair of quantum bits [J]. Physical review letters 1997, 26(26).
[14] Wootters WK.. Entanglement of formation of an arbitrary state of two qubits [J]. Physical review letters 1998, 10(10).
[15] WERNER R F. Quantum states with Einstein-Podolsky-Rosen correlations admitting a hidden-variable model [J]. {H}Physical Review A 1989, 40.
[16] ZHANG Fulin, JIANG Yue, LIANG Mailin. Speed of disentanglement in multiqubit systems under depolarizing channel [J]. {H}ANNALS OF PHYSICS 2013, 333.
[17] MUNRO W, JAMES D F V, WHITE A G. Maximizing the entanglement of two mixed qubits [J]. {H}Physical Review A 2001, 64.
[18] Zyczkowski K., Sanpera A., Lewenstein M., Horodecki P.. Volume of the set of separable states [J]. Physical Review, A 1998, 2(2).
