Enhanced photon blockade in an optomechanical system with parametric amplification

TL;DR

This paper introduces a scheme using optical parametric amplification in an optomechanical system to significantly improve single- and two-photon blockade effects, enabling efficient high-quality single-photon sources without requiring strong coupling.

Contribution

The proposed scheme enhances photon blockade effects in standard optomechanical systems via OPA, avoiding the need for strong coupling and improving multi-photon suppression.

Findings

Achieved perfect single-photon blockade with high occupancy probability.

Enhanced two-photon blockade and widened operational region.

Derived optimal parameters for maximizing photon emission while suppressing higher excitations.

Abstract

We propose a scheme to enhance the single- and two-photon blockade effect significantly in a standard optomechanical system (OMS) via optical parametric amplification (OPA). The scheme does not rely on the strong single-photon optomechanical coupling and can eliminate the disadvantages of suppressing multi-photon excitation incompletely. Through analyzing the single-photon blockade (1PB) mechanism and optimizing the system parameters, we obtain a perfect 1PB with a high occupancy probability of single-photon excitation, which means that a high quality and efficient single-photon source can be generated. Moreover, we find that not only the two-photon blockade (2PB) effect is significantly enhanced but also the region of 2PB occurring is widened when the OPA exists, where we also derive the optimal parameter condition to maximize the two-photon emission and the higher photon excitations are intensely suppressed at the same time.