Photon antibunching in a cavity-QED system with two Rydberg-Rydberg interaction atoms

TL;DR

This paper investigates photon antibunching in a cavity-QED system with two Rydberg atoms, showing how different blockade mechanisms are affected by Rydberg interactions, guiding single photon emitter development.

Contribution

It demonstrates the effects of Rydberg-Rydberg interactions on photon blockade mechanisms in cavity-QED systems, proposing ways to enhance photon antibunching.

Findings

Unconventional and conventional photon blockade occur in atom-driven schemes.

Rydberg-Rydberg interaction significantly influences photon antibunching.

Combining blockade mechanisms can enhance photon antibunching and mean photon number.

Abstract

We propose how to achieve strong photon antibunching effect in a cavity-QED system coupled with two Rydberg-Rydberg interaction atoms. Via calculating the equal time second order correlation function g(2)(0), we find that the unconventional photon blockade and the conventional photon blockade appear in the atom-driven scheme, and they are both significantly affected by the Rydberg-Rydberg interaction. We also find that under appropriate parameters, the photon antibunching and the mean photon number can be significantly enhanced by combining the conventional photon blockade and the unconventional photon blockade. In the cavity-driven scheme, the existence of the Rydberg-Rydberg interaction severely destroys the photon antibunching under the unconventional photon blockade mechanism. These results will help to guide the implementation of the single photon emitter in the Rydberg atoms-cavity system.