量子态的非相干光时域测量  

Measurement of quantum states with incoherent light

作　　者：马瑞琼[1] 李永放[1] 时坚[2] 

机构地区：[1]陕西师范大学物理学与信息技术学院,西安710062 [2]西安邮电学院电子与信息工程系,西安710061

出　　处：《物理学报》2008年第9期5593-5599,共7页Acta Physica Sinica

基　　金：陕西省自然科学基金(批准号:2007A04)资助的课题~~

摘　　要：提出了利用非相干光实现对量子态的时域高分辨率测量的新方法.以测量Autler-Townes效应为例,通过对信号解析表达式的详细讨论,阐述了利用这种方法测量量子态的物理过程,揭示出被测量的演化规律及测量过程对量子态的影响.研究结果表明利用这种方法既可以有效地、高分辨地测量很小的量子态能级间距和很大的原子能级间距,同时又可以测量相干量子态的横向弛豫速率.通过对时域和频域测量方法的比较表明利用非相干光对量子态的时域测量可以全面揭示量子态演化信息.A novel and high resolution method for measuring quantum states with incoherent light in the time-domain is presented. Taking Autler-Townes effect as an example, the physical process and the evolution rule during measurement are discussed by an explicit analytical formulation in detail; and the influence of measuring process on the quantum state is disclosed. With this method, very smalt splitting of the energy-level and large energy-level space can be measured readily at the same time, while the transverse relaxation rate of the system can be obtained directly by checking the decay time of the signal. Compared with the characteristics of the measuring methods between the time-domain and frequency-domain, we found that the measuring quantum states with incoherent light in the time-domain is robust and valid for disclosing information of the quantum state completely.

关 键 词：非相干光 量子态测量 Autler-Townes效应 

分 类 号：O431.2[机械工程—光学工程]