Enhancement of photon blockade effect via quantum interference

TL;DR

This paper investigates how quantum interference can enhance photon blockade in coupled cavity systems, revealing new regimes and mechanisms for controlling photon interactions in various experimental setups.

Contribution

It introduces a comprehensive analysis of photon blockade effects driven by quantum interference, applicable to multiple physical platforms, and explores the coexistence of different blockade regimes.

Findings

Photon blockade via destructive interference exists in the conventional regime.

Unconventional photon blockade occurs in both weak and strong Kerr nonlinearities.

The model is experimentally feasible in various coupled cavity systems.

Abstract

We study the photon blockade effect in a coupled cavity system, which is formed by a linear cavity coupled to a Kerr-type nonlinear cavity via a photon-hopping interaction. We explain the physical phenomenon from the viewpoint of the conventional and unconventional photon blockade effects. The corresponding physical mechanisms of the two kinds of photon blockade effects are based on the anharmonicity in the eigenenergy spectrum and the destructive quantum interference between two different transition paths, respectively. In particular, we find that the photon blockade via destructive quantum interference also exists in the conventional photon blockade regime, and that the unconventional photon blockade occurs in both the weak- and strong-Kerr nonlinearity cases. The photon blockade effect can be observed by calculating the second-order correlation function of the cavity field. This model is general and hence it can be implemented in various experimental setups such as coupled optical-cavity systems, coupled photon-magnon systems, and coupled superconducting-resonator systems. We present some discussions on the experimental feasibility.