Parity-Time Symmetry-Enhanced Simultaneous Magnon and Photon Blockade in Cavity Magnonic System

TL;DR

This paper demonstrates that PT-symmetry in a cavity magnonic system enhances magnon and photon blockade effects, allowing for effective blockade with smaller Kerr nonlinearities and without intrinsic photonic nonlinearity.

Contribution

It introduces a PT-symmetric cavity magnonic system that relaxes the Kerr nonlinearity requirement for blockade and shows simultaneous magnon and photon blockade effects.

Findings

PT-symmetry phase enables effective magnon blockade with small Kerr nonlinearity

Photon blockade can occur without intrinsic photonic Kerr nonlinearity

PT-symmetry generates an effective photonic Kerr nonlinearity

Abstract

The main challenge in the recent demonstration of conventional magnon blockade is to increase the nonlinearity of the system especially in comparison with the dissipation channels. One can consider the Kerr nonlinearity through which magnon blockade in a cavity magnonic system is possible provided that the Kerr nonlinearity is much stronger than the cavity and magnonic mode dissipation rates. In the present contribution, we consider a PT-symmetric cavity magnonic system and study the effect of PT-symmetric phase on the magnon statistics and hence magnon blockade. We show that the PT-symmetric phase, which is achievable by properly selecting the system parameters, can relax the requirement of large Kerr nonlinearity such that a perfect magnon blockade can be easily obtained even under a small value of Kerr nonlinearity. Surprisingly, although there is no photonic Kerr nonlinearity in the scheme, photon blockade can also occur simultaneously with magnon blockade. This result is arising from the PT-symmetric phase which can generate an effective photonic Kerr nonlinearity.