Implementation of Composite Photon Blockade Based on Four-wave Mixing System

TL;DR

This paper explores a novel composite photon blockade phenomenon in a four-wave mixing system, combining conventional and unconventional blockade effects to enhance single-photon source quality through analytical and numerical methods.

Contribution

It introduces the concept of composite photon blockade where CPB and UPB occur simultaneously, improving single-photon purity and brightness in a four-wave mixing system.

Findings

Composite photon blockade reduces g(2)(0) values.

Enhanced single-photon purity and brightness.

Conditions for simultaneous CPB and UPB are identified.

Abstract

A high-quality single-photon blockade system can effectively enhance the quality of single-photon sources. Conventional photon blockade(CPB) suffers from low single-photon purity and high requirements for system nonlinearity, while unconventional photon blockade(UPB) has the disadvantage of low brightness. Recent research by [Laser Photon.Rev 14,1900279,2020] demonstrates that UPB can be used to enhance the strength of CPB, thereby improving the purity of single-photon sources. Research by [Opt. Express 30(12),21787,2022] shows that there is an intersection point between CPB and UPB in certain nonlinear systems, where the performance of single photons is better. In this study, we investigated the phenomenon of photon blockade in a non-degenerate four-wave mixing system, where CPB and UPB can occur simultaneously within the same parameter range. We refer to this phenomenon as composite photon blockade. Particularly, when the system achieves composite photon blockade, the value of g(2)(0) is smaller, and there are more single photons. We conducted analytical analysis and numerical calculations to study the conditions for the realization of CPB, UPB, and 2PB in the system, and discussed in detail the influence of system parameters on various blockade effects.