Theoretical study of early-time superradiance for atom clouds and arrays
Theoretical study of early-time superradiance for atom clouds and arrays
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DOI：
10.1103/physreva.104.063706
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发表时间：
2021-10
影响因子：
2.9
通讯作者：
F. Robicheaux
中科院分区：
文献类型：
--
作者：
F. Robicheaux
我们通过检查 t = 0 时光子发射率的泰勒级数展开来探索原子云中迪克超辐射的条件。通过将超辐射定义为 t ∼ 0 时光子发射率的增加，我们计算了各种情况下的超辐射的条件。我们研究了针对所有角度的光子发射定义的超辐射度以及仅在特定方向检测到光子发射的定向超辐射度。尽管所有示例都是针对在 t = 0 时完全反转的二能级原子，但我们还给出了部分反转的二能级原子和完全反转的多能级原子的方程。我们给出了一种算法，可以有效地评估原子阵列的这些方程，并确定大原子数的超辐射条件。
We explore conditions for Dicke superradiance in a cloud of atoms by examining the Taylor series expansion of the photon emission rate at t = 0. By defining superradiance as an increasing photon emission rate for t ∼ 0, we have calculated the conditions for superradiance for a variety of cases. We investigate superradiance as defined for photon emission into all angles as well as directional superradiance where the photon emission is only detected in a particular direction. Although all of the examples are for two-level atoms that are fully inverted at t = 0, we also give equations for partially inverted two-level atoms and for fully inverted multilevel atoms. We give an algorithm for efficiently evaluating these equations for atom arrays and determine superradiance conditions for large atom number.