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Physical Review A

Electromagnetically-induced-transparency-like phenomena in a dissipatively coupled nonlinear system

Yuanwei Zhang

Published Nov 1, 2024• 1 citation
Publisher

Abstract

We theoretically investigate a nonlinear model with dissipative coupling. In this system, the cavity mode and the subharmonic mode are coupled through a two-photon process. In addition, the subharmonic mode is also dissipatively coupled with the magnons of an yttrium-iron-garnet sphere. By calculating the retarded Green's function, we investigate the response behavior of the system to external probing field. We find the nonlinear processes can be manipulated by the dissipative coupling. In particular, a phenomenon similar to electromagnetically induced transparency has emerged. These results show that the nonlinear system with dissipative coupling is a promising platform for controlling light propagation and light manipulation operations, and has potential applications for the quantum information processes.

DOI
10.1103/physreva.110.053701

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We theoretically investigate a nonlinear model with dissipative coupling. In this system, the cavity mode and the subharmonic mode are coupled through a two-photon process. In addition, the subharmonic mode is also dissipatively coupled with the magnons of an yttrium-iron-garnet sphere. By calculating the retarded Green's function, we investigate the response behavior of the system to external probing field. We find the nonlinear processes can be manipulated by the dissipative coupling. In particular, a phenomenon similar to electromagnetically induced transparency has emerged. These results show that the nonlinear system with dissipative coupling is a promising platform for controlling light propagation and light manipulation operations, and has potential applications for the quantum information processes.
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Realizing a strong light-matter interaction via magnetic dipoles is of fundamental importance in physics, and a cavity magnonics system has provided a unique platform to achieve strong and even ultrastrong light-matter interaction. In this work, transparency induced by magnon-photon interactions in cavity quantum electrodynamics (QED) system coupling a yttrium-iron-garnet (YIG,Y3Fe5O12) (YIG) sphere has been investigated. The spectral separation reveals a linear relationship with the coupling strength, which might find applications in magnon dark state and magnon-based quantum information processing.
We propose an alternative scheme to achieve the cross-correlations between magnon and photon in a hybrid nonlinear system including two microwave cavities and one yttrium iron garnet (YIG) sphere, where two cavities nonlinearly interact and meanwhile one of cavities couples to magnon representing the collective excitation in YIG sphere via magnetic dipole interaction. Based on dispersive couplings between two cavities and between one cavity and magnon with the larger detunings, the nonlinear interaction occurs between the other cavity and magnon, which plays a crucial role in generating quantum correlations. By analyzing the second-order correlation functions via numerical simulations and analytical calculations, the remarkable nonclassical correlations are existent in such a system, where the magnon blockade and photon antibunching could be obtainable on demand. The scheme we present is focused on the magnon-photon cross-correlations in the weak coupling regime and relaxes the requirements of experimental conditions, which may have potential applications in quantum information processing in the hybrid system.
In the past few years, the emerging photon-magnon dissipative coupling offers us an effective way to design and exploit losses to fulfill quantum tasks in hybrid cavity magnonics systems. In this paper, we theoretically investigate the dissipative-coupling-induced transparency (DCIT) and the enhancement of the high-order sidebands in a dissipative photon-magnon coupling system with Kerr nonlinearity. We find that the DCIT can be observed with both a weak and strong driving field. Due to the existence of the Kerr nonlinearity and introduction of the strong driving field of magnon, the sidebands can be enhanced highly by choosing the optimized parameters. In order to find the optimized parameters to enhance sidebands, we utilize the eigenvalues of the effective Hamiltonian to find the critical point of the stability region, near which sidebands can be enhanced in maximal degree.
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We propose a scheme to generate magnon-induced absorption (MIA) in a two-cavity magnonics system. By placing an yttrium iron garnet (YIG) sphere into one of two coupled microwave cavities, three different interference pathways are established by the photon coupling and magnon-photon coupling, leading to the conversion from suppression to enhancement on resonance under proper conditions. Most interestingly, the analytical results of the probe absorption are solved based on bright and dark modes in a dressed-state picture, which can be used to explain the position, width, and height of the absorption peaks accurately. Furthermore, we investigate the noise spectral density (NSD) of the microwave cavity and find out the similar MIA phenomena, which may provide a feasible way to remotely detect a magnon with an optical method.