Photon blockade in a double-cavity optomechanical system with nonreciprocal coupling

TL;DR

This paper investigates photon blockade phenomena in a double-cavity optomechanical system with nonreciprocal coupling, revealing optimal conditions for strong blockade and demonstrating the possibility of achieving perfect blockade with smaller optomechanical coupling.

Contribution

It introduces a novel analysis of photon blockade in a nonreciprocal double-cavity system, identifying conditions for strong and perfect blockade beyond traditional limits.

Findings

Optimal parameter relations for strong photon blockade identified.

Photon blockade behavior varies with nonreciprocal coupling.

Perfect photon blockade achievable with smaller optomechanical coupling.

Abstract

Photon blockade is an effective way to generate single photon, which is of great significance in quantum state preparation and quantum information processing. Here we investigate the statistical properties of photons in a double-cavity optomechanical system with nonreciprocal coupling, and explore the photon blockade in the weak and strong coupling regions respectively. To achieve the strong photon blockade, we give the optimal parameter relations under different blockade mechanisms. Moreover, we find that the photon blockades under their respective mechanisms exhibit completely different behaviors with the change of nonreciprocal coupling, and the perfect photon blockade can be achieved without an excessively large optomechanical coupling, i.e., the optomechanical coupling is much smaller than the mechanical frequency, which breaks the traditional cognition. Our proposal provides a feasible and flexible platform for the realization of single-photon source.