物理学报2012，Vol.61Issue(1)：190-195,6.
两量子比特与谐振子相耦合系统中的量子纠缠演化特性
Quantum evolution of entanglement property in two-qubit and oscillator coupling system
摘要
Abstract
Under the non-rotating wave approximation,the quantum evolution of entanglement property of a two-qubit and oscillator coupling system is accurately investigated by the method of coherent-state orthogonalization expansion.The property of the ground state for qubit-oscillator system and the difference between qubit-oscillator entanglement and qubit-qubit entanglement when resonant vibration occurs are discussed.The calculation results show that when the external field is not taken into consideration,the qubit-qubit entanglement reduces from 1 to 0 rapidly with the increase of coupling strength,indicating the strong sensitivity of the entanglement to the coupling strength.On the contrary,with the increase of the coupling the qubit-oscillator entanglement rises from 0,but does not reach the maximum value 2.At the beginning,when the two qubits do not entangle,the vacuum field does not lead to the entanglement in weak coupling.However,the strong coupling can induce the sudden appearance of the entanglement.关键词
相干态正交化展开/非旋波近似/量子纠缠Key words
coherent-state orthogonalization expansion/non-rotating wave approximation/quantum entanglement分类
数理科学引用本文复制引用
夏建平,任学藻,丛红璐,王旭文,贺树..两量子比特与谐振子相耦合系统中的量子纠缠演化特性[J].物理学报,2012,61(1):190-195,6.基金项目
西南科技大学研究生创新基金（批准号：10ycjj22）资助的课题~~ （）
