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The European Physical Journal D

Sub-radiation versus super-radiation from a system of a spatially distributed two-level atoms

Vladimír Bužek

Published Jun 1, 1990• 12 citations
Publisher
DOI
10.1007/bf01437662

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arXiv:1610.09128•Oct 28, 2016•0 citations
In a cascade three-level atomic system, a parametric study of sub-Poisson or super-Poisson distribution of a stimulated field was performed. By numerical calculation and figures, we investigated the time evolution of the sub-Poisson distribution of a radiation field. We found that different atomic initial states and different ratios of photon numbers of two radiation fields as well as different ratios of two transitions have a remarkable influence on this distribution. It is interesting to note that under certain conditions, in this cascade structure, there is a high degree of super-Poisson distribution that has not been reported in other structures. We try to explore this anomaly in detail.
We theoretically investigate the collective emission of one and two circular arrays of two-level atoms surrounding an optical nanofiber (ONF). Our study reveals that the radiation eigenmodes (REMs) of a single ring selectively couple to specific guided modes of the fiber, depending on their symmetry. By tuning the physical parameters of the system, we demonstrate that the emission towards radiation modes can be highly suppressed, thereby enhancing the lifetime of the atomic excitation. Two identical rings positioned at a distance from each other along the nanofiber can exchange an excitation even at large separations through nanofiber guided modes. This results in enhanced sub-and super-radiance compared to the single-ring case. The selective coupling of REMs to specific guided modes and the enhanced sub-and super-radiance in a two-ring system suggest that the ring configuration is promising for implementing efficient and versatile light-matter nanofiber-based interfaces and achieving waveguide quantum electrodynamics (WQED).
We investigate the super and sub-radiance characteristics of the radiation emitted from a system of three two-level atoms, in the GHZ and W-states. The dipolar coupling between atoms leads to two distinct configurations, one in which the three atoms are on a line, and the other in a closed loop form, wherein each atom interacts with both its neighbours. The quantum statistical properties of the emitted radiation show distinctly different characteristics for the GHZ and W-states resulting from the above configurations. The far-field radiation pattern also shows distinct differences between differently entangled states, making it possible for optical probing of entangled states.