Quantum Light on Demand

TL;DR

This paper demonstrates controlled quantum light generation using a three-atom system, revealing how entanglement, discord, and monogamy influence superradiance, subradiance, and photon statistics at various temperatures.

Contribution

It introduces the role of three-body correlations and monogamy scores in controlling quantum radiation properties in a three-atom system, a novel insight.

Findings

Identification of two phases with distinct entanglement and radiation patterns.

Persistence of sub and superradiance at higher temperatures without entanglement but with discord.

Radiation intensity as a precise measure of inter-atomic distance.

Abstract

We demonstrate that light quanta of well defined characteristics can be generated in a coupled two-level system of three atoms. The quantum nature of light is controlled by the entanglement structure, discord, and monogamy of the system which leads to sub and superradiant behavior as well as sub-Poissonian statistics, at lower temperatures. Two distinct phases with different entanglement characteristics are observed with uniform radiation in one case and the other displaying highly focused and anisotropic radiation in far field regime. At higher temperatures, sub and superradiant light is found to persist in the absence of entanglement but with non-zero quantum discord, showing bunching of photons. It is shown that the radiation intensity can be a precise estimator of the inter-atomic distance of coupled two-level atomic systems. Our investigation shows for the first time, the three body correlation in the form of `monogamy score' controlling sub and superradiant nature of radiation intensity.