物理学报Issue(14)：1-9,9.DOI:10.7498/aps.63.140302
单-双模组合压缩热态的纠缠性质及在量子隐形传态中的应用
Entanglement of one- and two-mo de combination squeezed thermal states and its application in quantum telep ortation
摘要
Abstract
In view of the fact that one- and two-mode combination squeezed vacuum states may exhibit stronger squeezing in a certain range, we introduce one- and two-mode combination squeezed thermal states (OTCSTS) and investigate the property of entanglement in detail. Using the remarkable property of Weyl ordering, i.e., the order-invariance of Weyl ordered operator under similar transformations, we conveniently derive the analytical expression of entanglement degree-logarithmic negativity, and then present the condition of keeping entanglement for these squeezed thermal states. It is found that the OTCSTS possesses higher entanglement than the usual two-mode squeezed thermal states for any non-zero squeezing parameter. As an application, the quantum teleportation for coherent state is considered by using the OTCSTS as an entangled channel. It is shown that the teleportation fidelity can only be enhanced within a certain range of parameters, which is just the same as the condition of exhibiting stronger squeezing in one quadrature. In addition, the condition of realizing effective quantum teleportation (>1/2) is obtained analytically.关键词
单-双模组合压缩热态/Wigner函数/纠缠/量子隐形传态Key words
one- and two-mode combination squeezed thermal states/Wigner function/entanglement/quantum teleportation引用本文复制引用
刘世右,郑凯敏,贾芳,胡利云,谢芳森..单-双模组合压缩热态的纠缠性质及在量子隐形传态中的应用[J].物理学报,2014,(14):1-9,9.基金项目
国家自然科学基金(批准号:11264018)、江西省自然科学基金(批准号:20132BAB212006)和江西省教育厅科技项目(批准号:GJJ14274)资助的课题 （批准号:11264018）
