耗散腔中两二能级原子的量子退相干  

Quantum decoherence of two-level atoms' quantum states in the dissipative cavity

作　　者：刘万芳[1] 杨培芳[2] 余春日[1] 张平伟[1] 

机构地区：[1]安庆师范学院物理与电气工程学院,安庆246011 [2]浙江师范大学物理系,金华130022

出　　处：《四川大学学报（自然科学版）》2009年第1期159-162,共4页Journal of Sichuan University(Natural Science Edition)

基　　金：安庆师范学院科研启动资金(044-K05000000060)

摘　　要：在能量耗散腔中,原子用泡利算符描述,光场用相干态描述,运用密度矩阵理论,得到了两二能级原子密度矩阵元的演化规律及退相干因子。分析与单模辐射场作用过程中原子态的量子相干性。结果表明:原子态的量子相干性的演化特性取决于原子-场耦合常数。In this paper, the two-level atom is described by Pauli sign and the optical field is described by coherent state. The two-level atoms＇ reducible density rectangular array and decoherence factor are obtained using the density matrix theory. We discuss the coherence of quantum state of two-level atoms interacting with a single-mode field in a dissipative cavity. The results show that the evolution properties of the quantum coherence depend on the coupling constant, the average photon number of the cavity field, and the cavity leakage rate.

关 键 词：二能级原子 耗散腔 单模辐射场 退相干因子 

分 类 号：O431.2[机械工程—光学工程]