Tunable photon blockade in a two-mode second-order nonlinear system embedded with a two-level atom

TL;DR

This paper investigates tunable photon blockade in a two-mode nonlinear system with a two-level atom, demonstrating strong antibunching and perfect blockade regions that are robust and experimentally feasible.

Contribution

It introduces a scheme for tunable photon blockade in a two-mode nonlinear system with a two-level atom, highlighting the effects of coupling coefficients on blockade regions.

Findings

Strong photon antibunching achieved in the system

Perfect blockade regions formed near specific coupling coefficients

Scheme is robust against reservoir temperature variations

Abstract

The conventional photon blockade for high-frequency mode is investigated in a two-mode second-order nonlinear system embedded with a two-level atom. By solving the master equation and calculating the zero-delay-time second-order correlation function $g^{(2)}(0)$, we obtain that strong photon antibunching can be achieved in this scheme. In particular, we find that by increasing the linear coupling coefficient of the system, a perfect blockade region will be formed near the zero second-order nonlinear coupling coefficient. Similarly, by increasing the nonlinear coupling coefficient of the system, the perfect blockade zone will appear. And this scheme is not sensitive to the reservoir temperature, both of which make the current system easier to implement experimentally.