Dai you huan jiao huan zuo yong de zi xuan 1/2 ti zi mo xing zhong de liang zi jiu chan

Song Junliang = 帶有環交換作用的自旋1/2梯子模型中的量子纠缠 / 宋均亮.Thesis (M.Phil.)--Chinese University of Hong Kong, 2006.Includes bibliographical references (leaves 60-67).Text in English; abstracts in English and Chinese.Song Junliang = Dai you huan jiao huan zuo yong de zi xuan 1/2 ti zi mo xing zhong de liang zi jiu chan / Song Junliang.Chapter 1 --- Introduction --- p.1Chapter 1.1 --- What is Entanglement --- p.1Chapter 1.2 --- Quantum Information and Entanglement --- p.4Chapter 1.3 --- Entanglement in Condensed Matter Physics --- p.6Chapter 1.4 --- The S = 1/2 Spin Ladder with Ring Exchange --- p.9Chapter 1.5 --- Arrangement of the Thesis Writing --- p.11Chapter 2 --- Measures of Entanglement --- p.13Chapter 2.1 --- Axiomatic Approach --- p.14Chapter 2.2 --- Entropy of entanglement in pure states --- p.16Chapter 2.3 --- Concurrence --- p.17Chapter 2.4 --- Negativity --- p.19Chapter 2.5 --- Other measurements --- p.20Chapter 3 --- Entanglement in S=l/2 Ladder with Ring Exchange at T=0 --- p.22Chapter 3.1 --- Model Hamiltonian and Phase Diagram --- p.22Chapter 3.2 --- Ground-state concurrence --- p.24Chapter 3.3 --- Two-site entanglement of the rung and the SU(4) point --- p.29Chapter 3.4 --- Scaling behavior of the block-block entanglement --- p.34Chapter 3.5 --- Entanglement of the Ferromagnetic state --- p.37Chapter 3.6 --- Other Measurements --- p.42Chapter 3.7 --- Summary and Discussion --- p.43Chapter 4 --- Thermal Entanglement --- p.45Chapter 4.1 --- A Four-Spin Plaquette --- p.46Chapter 4.2 --- Thermal concurrence --- p.50Chapter 4.3 --- Magnetic susceptibility as Entanglement Witness --- p.52Chapter 4.4 --- Numerical results in a 6 x 2 ladder --- p.54Chapter 4.5 --- Summary and Discussion --- p.55Chapter 5 --- Conclusion and future work --- p.58Bibliography --- p.6