Λ型三能级原子与Pólya态光场相互作用系统中的量子特性

Quantum Properties in a System of the Pólya State Field Interacting with a Λ-type Three-level Atom

运用全量子理论,探讨了Pólya态光场在与Λ型三能级原子相互作用时,原子初态及某些光场参数对粒子布居数反转、光子反聚束效应以及光场压缩特性的影响。结果表明:原子处于不同初态时,光场概率参数、最大光子数及光场分布参数对系统光场粒子布居数反转的回复-崩塌现象有着显著的影响;初态为激发态或相干叠加态时,在光场概率参数、原子相对失谐量、最大光子数和光场分布参数的影响下,系统光场均可在一定条件下表现为完全的聚束效应或者完全的反聚束效应,但初态不同影响规律也各不相同;如果初态处于激发态,且原子相对失谐量、光场概率参数和最大光子数同时较小,则系统光场的X1分量可以间歇性的出现短时间的压缩。

The effects of the atomic initial states and some parameters on the population inversion,optical field squeezing properties and photon anti-bunching effects in a system of the radiation field in Pólya state interacting with aΛ-type three-level atom are discussed on the full quantum theory.The results show that when the atoms are in different fixed initial states,the changes for the light field probability parameters,the maximum photon number and the light field distribution parameters have an obvious influence on the recovery-collapse phenomenon of the population inversion in the system.As the initial state is the excited state or the coherent superposition state,the light field can exhibit the completely bunching or anti-bunching effect under some certain conditions of the above optical field parameters.The different initial conditions correspond to different changing manners for the observed physical quantities.If the initial state of the atom is in an excited state,and the relative detuning of the atom,the probability parameter of the light field and the maximum number of photons are simultaneously small,and the X1 component of the light field in the system may intermittently display the squeezing effect during the short time.