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Physical Review A

Magnon-squeezing-enhanced slow light and second-order sideband in cavity magnomechanics

Tian-Xiang Lu, Xing Mao Xiao, Liu-Sha Chen, Qian Zhang, Hui Jing

Published Jun 29, 2023• 62 citations
Publisher

Abstract

Cavity magnomechanics (CMM) has rapidly become a new research field of cavity quantum electrodynamics for studying quantum information processing and sensing. Here, we theoretically study the magnomechanically induced transparency effect in a cavity magnomechanical system, focusing on the role of magnon squeezing in enhancing and controlling the group delay of the transmitted light. As a result, we find that the magnon number can be strongly affected by magnon squeezing, accompanied by a steerable transmission rate and controllable fast-to-slow light switching. In particular, in the photon-magnon strong-coupling scenario, the group delay of the probe field can be enhanced by about three times by using magnon squeezing compared to the case without magnon squeezing. Moreover, due to the presence of magnon squeezing, the efficiency of the second-order sideband in the photon-magnon weak-coupling scenario can also be enhanced compared to the case without magnon squeezing. These results provide tools to engineer CMM devices with magnon squeezing for, e.g., light propagation and storage, and precision measurements of weak signals.

DOI
10.1103/physreva.107.063714

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Abstract We theoretically analyze the transmission characteristics of a magnon–photon coupling system based on ultrastrong optomechanical-like coupling via the cross-Kerr interaction. We use the definition of group delay to characterize the fast and slow light effects. It is found that the group delay of our system can be significantly improved by two to three orders of magnitude compared to previous studies in magnon–photon coupling systems, which means slow light effect can be significantly enhanced. By adjusting the driving power and frequency detuning of the microwave cavities, the magnitude and bandwidth of the group delay and transmittance can be adjusted precisely. Moreover, frequency control of slow light can be achieved by manipulating the strength of magnetic field. The influence of the cross-Kerr coupling strength of cavities on the system is also discussed in detail. The group delay of the system is close to milliseconds, while the transmittance is greatly improved. The result from this paper hopes to bring new development possibilities for the fabrication of optical memory and the construction of all-optical networks.
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