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arXiv 1108.0641quant-ph
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四能级原子系统数相互补的信息论研究

An information theoretic study of number-phase complementarity in a four level atomic system

Archana Sharma, R. Srikanth, Subhashish Banerjee, Hema Ramachandran

摘要:

研究了在电磁感应透明(EIT)和相干布居囚禁(CPT)条件下,激光驱动的四能级原子系统中的数-相位不确定性。不确定性描述使用(熵)知识的两个互补变量,即数量和相位,其中知识被定义为相对于均匀分布的相对熵。在耦合激光和探测激光强度近似相等的情况下,原子处于CPT态,基态之间存在相干性,相应地,存在大的相位知识和较低的数目知识。当耦合激光强度大得多且原子处于EIT态时,情况正好相反。我们还研究了这些影响中存在的高阶非线性吸收,这被认为是产生退相效应。

英文摘要:

We study number-phase uncertainty in a laser-driven, effectively four-level atomic system under electromagnetically induced transparency (EIT) and coherent population trapping (CPT). Uncertainty is described using (entropic) knowledge of the two complementary variables, namely, number and phase, where knowledge is defined as the relative entropy with respect to a uniform distribution. In the regime where the coupling and probe lasers are approximately of equal strength, and the atom exists in a CPT state, there is coherence between the ground states, and correspondingly large phase knowledge and lower number knowledge. The situation is the opposite in the case where coupling laser is much stronger and the atom exists in an EIT state. We study these effects also in the presence of a higher-order nonlinear absorption, which is seen to produce a dephasing effect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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