Geometric Phase for a Qutrit-Qubit Mixed-Spin System  

作　　者：ZHANG Ai-Ping QIANG Wen-Chao LING Ya-Wen XIN Hong YANG Yong-Ming 张爱萍;强稳朝;凌亚文;辛红;杨永明(Faculty of Science,Xi’an University of Architecture and Technology,Xi’an 710055)

机构地区：[1]Faculty of Science,Xi’an University of Architecture and Technology,Xi’an 710055

出　　处：《Chinese Physics Letters》2011年第8期5-8,共4页中国物理快报（英文版）

基　　金：by the Natural Science Basic Research Plan of Shaanxi Province(SJ08A13);the NSF of the Education Bureau of Shaanxi Province(O9jk534)。

摘　　要：We study the geometric phase of a qutrit-qubit mixed-spin system in an external homogeneous magnetic field.Both the spin-spin interaction strength𝐽and the external magnetic field𝐵can affect the geometric phase of the system.In addition,we consider the negativity of the composite system.The relationship between the negativity and the geometric phase is obtained.Finally,we calculate the geometric phase for a thermal mixed state and show how the geometric phase depends on the rescaled coupling parameter and temperature.In the limit𝑇T→0,we can recover the result of the ground state.This analysis has some implications in realistic implementations of geometric quantum computation.

关 键 词：TEMPERATURE COMPUTATION FIELD 

分 类 号：O41[理学—理论物理]