均匀激发N原子云单光子关联自发发射的动力学演化
Dynamical evolution of correlated spontaneous emission of a single photon from a uniformly excited cloud of N atoms
摘要：
本文研究了由单光子吸收均匀激发的N原子稠密球形云的关联自发发射。我们发现，这种状态的衰减依赖于有效拉比频率ω，这是正比于sqrt{N}，和光子飞行通过云的时间R/c之间的关系。如果Ω *R/c < 1，则状态以Ω ^{2}*R/c的速率指数衰减，并且状态寿命大于R/c。在相反的极限Omega*R/c >> 1时，耦合的原子辐射系统在集体Dicke态（无光子）和原子基态（有一个光子）之间以频率Omega振荡，同时以速率c/R衰减。
英文摘要：
We study the correlated spontaneous emission from a dense spherical cloud of N atoms uniformly excited by absorption of a single photon. We find that the decay of such a state depends on the relation between an effective Rabi frequency Omega, which is proportional to sqrt{N}, and the time of photon flight through the cloud R/c. If Omega*R/c < 1 the state exponentially decays with rate Omega^{2}*R/c and the state life time is greater then R/c. In the opposite limit Omega*R/c >> 1, the coupled atom-radiation system oscillates between the collective Dicke state (with no-photons) and the atomic ground state (with one photon) with frequency Omega while decaying at a rate c/R.
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