Enhancement of quantum correlations in a cavity–magnon system with feedback control

Qin, SiYu; Xin, Xuanxuan; He, Shiwen; Li, Chong

doi:10.1364/josab.442375

Cited by 7 publications

(1 citation statement)

References 65 publications

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“…[24][25][26][27][28]. Studies based on magnon-photon coupling hybrid systems have revealed a number of interesting results in generation of the bell state [16,29,30], bistability [31][32][33], generation of the sideband [34][35][36], building entanglement [37][38][39][40] and so on.…”

Section: Introductionmentioning

confidence: 99%

Significantly enhanced slow light effect in magnon–photon coupling system via cross-Kerr interaction

Liu¹,

Yin²

2022

J. Phys. D: Appl. Phys.

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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 of this paper is hoped to bring new development possibilities for the fabrication of optical memory and the construction of all-optical networks.

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Section: Introductionmentioning

confidence: 99%

Significantly enhanced slow light effect in magnon–photon coupling system via cross-Kerr interaction

Liu¹,

Yin²

2022

J. Phys. D: Appl. Phys.

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Quantum Correlation Enhanced with Quantum Coherent Feedback Control in a Cavity‐magnon Hybrid System

Lin,

Lin

et al. 2024

Annalen der Physik

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A scheme is proposed to enhance quantum correlation, including entanglement and steering, for two magnon modes in a cavity‐magnon hybrid system through coherent quantum feedback. The hybrid system consists of a microwave cavity and two YIG spheres, which incorporates a nonlinear flux‐driven Josephson parametric amplifier in order for the generation of two photons within the cavity simultaneously. A quantum coherent feedback loop is used for the reduction of effective dissipation. By modulating feedback parameters, optimal bipartite and tripartite entanglement, as well as quantum steering are derived. Importantly, compared with the same setup without coherent feedback, the proposed scheme significantly improves quantum correlation. Furthermore, by optimizing the feedback reflectivity and the ratio of cavity‐magnon coupling strength, the enhancement of asymmetric steering can be controlled. Notably, incorporating the feedback loop effectively increase its robustness against thermal noise, thus the scheme offer better prospect for experimental development. This study paves the way for advancements in quantum information processing and quantum entanglement within cavity‐magnonics.

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Stationary Quantum Entanglement and Asymmetric Steering in Cavity Magnonic System with Floquet Field and Coherent Feedback

Guan,

Wang,

2024

Adv Quantum Tech

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A scheme is proposed to prepare quantum entanglement and quantum steering between two indirectly coupled microwave cavity modes within a hybrid cavity magnonic system. The system consists of two microwave cavities individually coupled to a common YIG sphere driven by a two‐tone Floquet field, while the output field of the second microwave cavity is fed back into the input port of the first microwave cavity via a coherent feedback loop. Floquet driving can effectively generate two interactions between magnons and photons. Magnons with higher dissipation can serve as a cooling channel for the two cavity modes. Optimal quantum correlations between the cavity modes can be achieved when the competition between these two interactions reaches equilibrium. Subsequently, a comparative analysis is performed on the evolution of quantum correlation with and without coherent feedback, revealing that the presence of a coherent feedback loop in the system not only significantly enhances entanglement and steering but also induces inherent asymmetry in quantum steering regardless of the decay rates within subsystems. Moreover, under the influence of the coherent feedback loop, the enhanced quantum correlations exhibit increased robustness against rising environmental temperatures. This work significantly expands the validity of implementation and provides a promising avenue for the preparation of stable quantum correlations.

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Enhancement of quantum correlations in a cavity–magnon system with feedback control

Cited by 7 publications

References 65 publications

Significantly enhanced slow light effect in magnon–photon coupling system via cross-Kerr interaction

Significantly enhanced slow light effect in magnon–photon coupling system via cross-Kerr interaction

Quantum Correlation Enhanced with Quantum Coherent Feedback Control in a Cavity‐magnon Hybrid System

Stationary Quantum Entanglement and Asymmetric Steering in Cavity Magnonic System with Floquet Field and Coherent Feedback

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