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Physical Review A

Magnon blockade based on the Kerr nonlinearity in cavity electromagnonics

Rui Hou, Wei Zhang, Xue Yan Han, Hong‐Fu Wang, Shou Zhang

Published Mar 22, 2024• 29 citations
Publisher

Abstract

Magnon blockade is an effective physical mechanism to generate a single magnon, which is of great importance in quantum information processing. We present a scheme to realize the unconventional magnon blockade effect by using Kerr nonlinearity in a cavity electromagnonic system. Under weak driving conditions, we give the optimal parameter conditions for magnon antibunching through analytical calculations, which are in good agreement with numerical results. Furthermore, we find that Kerr nonlinearity is necessary to create magnon blockade. In particular, unconventional magnon blockade can be achieved in both weak nonlinearity and weak coupling regimes. The present scheme indicates a method for generating unconventional magnon blockade effect and provides a feasible and flexible platform for the realization of a single-magnon source with high purity.

DOI
10.1103/physreva.109.033721

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Magnon blockade is an effective physical mechanism to generate a single magnon, which is of great importance in quantum information processing. We present a scheme to realize the unconventional magnon blockade effect by using Kerr nonlinearity in a cavity electromagnonic system. Under weak driving conditions, we give the optimal parameter conditions for magnon antibunching through analytical calculations, which are in good agreement with numerical results. Furthermore, we find that Kerr nonlinearity is necessary to create magnon blockade. In particular, unconventional magnon blockade can be achieved in both weak nonlinearity and weak coupling regimes. The present scheme indicates a method for generating unconventional magnon blockade effect and provides a feasible and flexible platform for the realization of a single-magnon source with high purity.
Abstract We propose a scheme for generating high-quality single-photon sources utilizing the conventional photon blockade (CPB) effect in a cavity optomagnonic system with Kerr nonlinearity. The realization of the CPB effect depends on both the Kerr nonlinearity and Kerr-like nonlinearity of the optical cavity, which is converted using magneto-optical coupling. The CPB effect can be realized in a cavity optomagnonic system with weak magneto-optical coupling by modulating the strength of the Kerr nonlinearity. Notably, our scheme supports photon blockade in both the strong and weak Kerr nonlinear regimes, which broadens the range of experimental parameters. Furthermore, we explored the parameter regimes where the CPB effect could not be achieved because of the combined effects of the magneto-optical coupling and Kerr nonlinearity. We also determined the optimal driving amplitude region for generating high-quality single-photon sources. This work not only provides a novel route for realizing the CPB effect but also establishes a versatile platform for producing single-photon sources with high purity and brightness.
We propose a hybrid cavity-magnon system scheme that integrates a yttrium iron garnet sphere with a microwave cavity filled with Kerr medium, aiming to achieve both conventional and unconventional photon blockade simultaneously. Our research demonstrates that by tuning the strength of the Kerr nonlinearity and adjusting the two-photon driving intensity, we can realize quantum effects associated with both types of photon blockade. Furthermore, through careful selection of system parameters, we have obtained optimal results for photon blockade under ideal conditions. This scheme fully exploits the advantages offered by both conventional and unconventional photon blockade mechanisms, effectively reducing the equal-time second-order photon correlation function while also achieving a higher mean photon number. It provides an alternative and experimentally feasible platform for preparing single-photon sources characterized by enhanced purity and brightness.
We investigate magnon statistics in a qubit-magnon hybrid quantum system in which an effective appreciable qubit-magnon coupling can be realized by exchanging virtual cavity photons. A conventional magnon blockade and two types of unconventional magnon blockades are proposed, respectively, based on three different physical mechanisms. We verify theoretically that a magnon blockade can occur in strong, weak, and moderate qubit-magnon coupling regimes. It is interesting that an asymmetry structure for magnon anti-bunching can be observed in the case of the moderate qubit-magnon coupling strength, especially where the quantum interference can significantly relax the requirement of the larger coupling strength between the qubit and magnon mode. All of the approximate analytical results for strong magnon anti-bunching are in good agreement with those obtained by numerical simulations. Our results provide a promising pathway for coherent manipulation in single magnon level, which has potential applications for quantum information processing and preparation of single magnon sources.
We present an alternative scheme to achieve nonreciprocal unconventional magnon blockade (NUMB) in a hybrid system formed by two microwave cavities and one yttrium iron garnet (YIG) sphere, where the pump and signal cavities interact nonlinearly with each other and the signal cavity is coupled to the YIG sphere. It is found that the nonlinear coupling occurs between the pump cavity and magnon modes due to the dispersive interactions among three bosonic modes. Meanwhile, the Kerr nonlinearity is present in the pump cavity. Based on these nonlinear effects, a nonreciprocal magnon blockade could be achieved with the help of weak parametric driving of the pump cavity. The present work provides an alternative method to prepare single magnon resource, which may be helpful for quantum information processing.
The quantum blockade effect is one of the important control methods for various quantum states. Recently, magnon has gradually become the focus of quantum device research due to its excellent properties such as stability, high spin density, and tunability. This study investigates the generation of conventional and unconventional single and double magnon blockades, as well as magnon-induced tunneling effects, in strongly nonlinearly coupled cavity–magnon systems. By adjusting the coupling strength and the driving field, we achieved single and double magnon blockades, along with magnon-induced tunneling effects. Interestingly, we found that the transition from a magnon blockade to magnon-induced tunneling can be controlled by modulating the driving field. To validate the feasibility of our model, we examined the impact of thermal noise at an experimental temperature of 20 mK. Our proposed scheme may offer a method to manipulate few-magnon states and holds potential applications in quantum communication and quantum information processing.
Abstract Magnon blockade (MB) is a fundamental quantum phenomenon for generating single-magnon states, and has gradually become one of the candidates for quantum information processing. We extend existing blockade optimization schemes to a hybrid system consisting of a YIG micromagnet and a skyrmion, and propose a theoretical scheme for achieving MB on this platform. Under weak magnon probing and external driving of the skyrmion qubit, the second-order correlation function is analytically derived, and the optimal parameter conditions for both conventional and unconventional MB are identified. By appropriately adjusting the intensities of the driving and probing fields, the MB effect is significantly enhanced, multi-magnon excitations are effectively suppressed, and strong antibunching is achieved. Further analysis reveals that MB originates from two distinct physical mechanisms: conventional blockade induced by anharmonicity of the energy level structure, and unconventional blockade arising from quantum interference between different transition paths. On this platform, the two mechanisms coexist and can be synergistically controlled, and their cooperation yields a blockade effect superior to that of either mechanism alone. This work thus provides a feasible theoretical scheme for the effective manipulation of MB effects.