Maximal and total skew information for a two-qubit system using nonlinear interaction models

doi:10.1088/1674-1056/20/9/090301

中国物理B ›› 2011, Vol. 20 ›› Issue (9): 90301-090301.doi: 10.1088/1674-1056/20/9/090301

Maximal and total skew information for a two-qubit system using nonlinear interaction models

李春杰¹, 孙红贵², 刘万芳³

(1)College of Physics, Changchun Normal University, Changchun 130032, China; (2)Mechanical and Electrical Engineering College, Jiaxing University, Jiaxing 314001, China; (3)School of Physics and Electric Engineering, Anqing Teachers College, Anqing 246011, China

收稿日期:2010-10-26 修回日期:2011-03-20 出版日期:2011-09-15 发布日期:2011-09-15

Maximal and total skew information for a two-qubit system using nonlinear interaction models

Sun Hong-Gui(孙红贵)^a)^†, Liu Wan-Fang(刘万芳)^b), and Li Chun-Jie(李春杰)^c)

^a Mechanical and Electrical Engineering College, Jiaxing University, Jiaxing 314001, China; ^b School of Physics and Electric Engineering, Anqing Teachers College, Anqing 246011, China; ^c College of Physics, Changchun Normal University, Changchun 130032, China

Received:2010-10-26 Revised:2011-03-20 Online:2011-09-15 Published:2011-09-15

摘要/Abstract

摘要： Maximal and total skew information is studied. For symmetric pure states of two-qubit, they are closely related to the linear entropy, the concurrence, and the spin squeezing parameter. For a two-qubit system implemented in three nonlinear interaction models with an external field, we give the exact state vectors and the expectation value 〈S_z〉 at any time t. Based on 〈S_z〉², we give the maximal and the total skew information and a condition in which the maximal and the total skew information can reach 1 and 2, respectively.

关键词: maximal and total Wigner—Yanase skew information, nonlinear interaction models, two-qubit system

Abstract: Maximal and total skew information is studied. For symmetric pure states of two-qubit, they are closely related to the linear entropy, the concurrence, and the spin squeezing parameter. For a two-qubit system implemented in three nonlinear interaction models with an external field, we give the exact state vectors and the expectation value 〈S_z〉 at any time t. Based on 〈S_z〉², we give the maximal and the total skew information and a condition in which the maximal and the total skew information can reach 1 and 2, respectively.

Key words: maximal and total Wigner—Yanase skew information, nonlinear interaction models, two-qubit system

中图分类号: (Quantum mechanics)

03.65.-w

03.67.-a (Quantum information) 05.45.-a (Nonlinear dynamics and chaos)

孙红贵, 刘万芳, 李春杰. Maximal and total skew information for a two-qubit system using nonlinear interaction models[J]. 中国物理B, 2011, 20(9): 90301-090301.

Sun Hong-Gui(孙红贵), Liu Wan-Fang(刘万芳), and Li Chun-Jie(李春杰) . Maximal and total skew information for a two-qubit system using nonlinear interaction models[J]. Chin. Phys. B, 2011, 20(9): 90301-090301.

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Maximal and total skew information for a two-qubit system using nonlinear interaction models

Maximal and total skew information for a two-qubit system using nonlinear interaction models

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