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

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

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.

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

Received: 26 October 2010
Revised: 20 March 2011
Accepted manuscript online:

PACS:	03.65.-w	(Quantum mechanics)
	03.67.-a	(Quantum information)
	05.45.-a	(Nonlinear dynamics and chaos)

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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 2011 Chin. Phys. B 20 090301

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[1]	Maximal and total skew information of three-qubit system obtained using nonlinear interaction models Sun Hong-Gui(孙红贵), Zhang Li-Hua(章礼华), Liu Wan-Fang(刘万芳), and Li Chun-Jie(李春杰) . Chin. Phys. B, 2012, 21(1): 010301.

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

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