两能级原子与热辐射场Raman相互作用时原子量子态保真度  

Fidelity of a Pair of Two-level Atoms in the Raman Interaction of Atoms with a Thermal Radiation Field by Atoms' Dipole-dipole Interaction

作　　者：张登玉[1] 高峰[1] 游开明[1] 

机构地区：[1]衡阳师范学院物理与电子信息科学系,湖南衡阳421008

出　　处：《量子光学学报》2008年第3期236-240,共5页Journal of Quantum Optics

基　　金：湖南省自然科学基金(06JJ50118);湖南省教育厅重点科研基金(04A006)

摘　　要：两个两能级原子置于热辐射场环境中,原子用泡利算符描述,环境用无穷的谐振子热库描述。原子与热库产生Raman相互作用,原子间存在偶极相互作用,运用密度矩阵方法,得到两能级原子密度矩阵元演化规律。针对四种不同的初始状态,分析置于热辐射场中原子量子态保真度。结果表明:两个原子初始处于不同量子叠加态,量子信息在传输过程中的保真度有明显的差异。The two-level atom is described by Pauli sign and environment is described by infinite harmonic particle thermal reservoir. A pair of two-level atoms＇ reducible density rectangular array is obtained when the Raman interaction of atoms with a thermal radiation field atoms by dipole-dipole interaction is put in a thermal reservoir. The paper has studied the fidelity of two-level atoms which are put in the strongly thermal radiation field. The properties of fidelity are discussed. It is shown that the two two-level atoms initially situated in different coherent superposition states, quantum information fidelities have obvious differences.

关 键 词：热辐射场 两能级原子 保真度 相干 消相干 

分 类 号：O431[机械工程—光学工程]