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Advanced Quantum Technologies

Coherent Interaction and Entanglement Generation in Hybrid Cavity‐Magnon Systems

Yü‐Rong Lin, Xiao‐Yu Bi, Sai-Yun Ye, Zhi‐Rong Zhong

Published Mar 31, 2026• 1 citation
Publisher

Abstract

ABSTRACT The realization of coherent coupling between two distinct systems within a hybrid framework represents an effective approach for exploring the unique properties of quantum mechanics. In this paper, we construct a hybrid cavity‐magnon system to achieve coherent coupling between a magnon and two atoms, assisted by the cavity field, when the magnon mode frequency is tuned to nearly twice the atomic transition frequency. This coherent coupling corresponds to the simultaneous excitation of two atoms by a single magnon mode, mediated by virtual states through counter‐rotating processes. Furthermore, this proposal can be directly applied to generate hybrid entanglement among the individual subsystems. A significant characteristic is that the cavity serves merely as a medium that is not effectively excited; therefore, decoherence effects caused by cavity leakage can be substantially suppressed. Moreover, this interaction is reciprocal, allowing two atoms in their ground states to simultaneously absorb one magnon and transition to their excited states, as well as allowing two atoms in their excited states to jointly emit a single magnon. Finally, we demonstrate that this simultaneous joint absorption and emission process can also occur when the two atoms are non‐identical.

DOI
10.1002/qute.202500931

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ABSTRACT The realization of coherent coupling between two distinct systems within a hybrid framework represents an effective approach for exploring the unique properties of quantum mechanics. In this paper, we construct a hybrid cavity‐magnon system to achieve coherent coupling between a magnon and two atoms, assisted by the cavity field, when the magnon mode frequency is tuned to nearly twice the atomic transition frequency. This coherent coupling corresponds to the simultaneous excitation of two atoms by a single magnon mode, mediated by virtual states through counter‐rotating processes. Furthermore, this proposal can be directly applied to generate hybrid entanglement among the individual subsystems. A significant characteristic is that the cavity serves merely as a medium that is not effectively excited; therefore, decoherence effects caused by cavity leakage can be substantially suppressed. Moreover, this interaction is reciprocal, allowing two atoms in their ground states to simultaneously absorb one magnon and transition to their excited states, as well as allowing two atoms in their excited states to jointly emit a single magnon. Finally, we demonstrate that this simultaneous joint absorption and emission process can also occur when the two atoms are non‐identical.
Here we show that it is possible to control magnon-magnon entanglement in a hybrid magnon-atom-cavity system based on atomic coherence. In a four-level V-type atomic system, two strong fields are applied to drive two dipole-allowed transitions and two microwave cavity modes are coupled with two dipole forbidden transitions as well as two magnon modes simultaneously. It is found that the stable magnon-magnon entanglement, one-way steering and two-way EPR steering can be generated and controlled by atomic coherence according to the following two points: (i) the coherent coupling between magnon and atoms is established via exchange of virtual photons; (ii) the dissipation of magnon mode is dominant over amplification since one of the atomic states mediated one-channel interaction always keeps empty. The coherent control of magnon-magnon correlations provides an effective approach to modify macroscopic quantum effects using the laser-driven atomic systems.
In general, a magnon does not interact directly with an atom. Here we present a scheme to generate coherent coupling between two magnons and a superconducting artificial atom via exchange of virtual photons in dispersive cavities. By probing into the induced magnon-atom interactions, we identify the two-magnon process, which causes almost perfect two-mode squeezing and entanglement of the two magnons for specific conditions. The quantum entanglement of the magnon modes in two massive ferrimagnets survives at the steady state and represents genuinely macroscopic quantum state. Our work offers an interesting alternative in designing experiments for generating the coherent coupling between the magnons and the atom. It finds broad applications in the investigation of macroscopic quantum effects and the preparation of quantum devices.
In this paper, we propose a quantum interference mediated control of switching between magnon-atom entanglement and magnon blockade. A three-level $\mathrm{\ensuremath{\Lambda}}$ configuration atomic ensemble and a yttrium iron garnet sphere are simultaneously coupled to a microwave cavity mode through magnetic dipole interaction. By applying two strong fields to drive the atoms, the resonant coupling between a dressed-state atomic transition and the magnon mode, without direct interaction, is established by adiabatically eliminating the cavity field. Interestingly, the anti-Jaynes-Cummings (JC) interaction and the JC interaction are alternatively formed when the atoms are trapped into different superposition states induced by quantum interference, causing the appearance of hybrid magnon-atom entanglement and magnon quantum blockade, respectively. The coherent-controlled hybrid magnon-atom entanglement and magnon blockade may find potential applications in quantum information processing.
We consider two separate atoms interacting with a single-mode optical resonator. When the frequency of the resonator field is twice the atomic transition frequency, we show that there exists a resonant coupling between one photon and two atoms, via intermediate virtual states connected by counter-rotating processes. If the resonator is prepared in its one-photon state, the photon can be jointly absorbed by the two atoms in their ground state which will both reach their excited state with probability close to one. Like ordinary quantum Rabi oscillations, this process is coherent and reversible, so that two atoms in their excited state will undergo a downward transition jointly emitting a single cavity photon. This joint absorption and emission processes can also occur with three atoms. The parameters used to investigate this process correspond to experimentally demonstrated values in circuit quantum electrodynamics systems.
Abstract A theoretical scheme for a single‐magnon generator based on a hybrid cavity‐magnonic system, in which a microwave cavity is coupled to the magnetostatic mode through the magnetic dipole interaction and coupled to a superconducting qubit (transmon) through electric dipole interaction, and the virtual excitation of microwave photons mediates the interaction between the magnon mode and the transmon qubit, is proposed. The magnon blockade effect is studied based on the coexistence mechanism of anharmonicity of energy levels and multipath interference, and a global optimal condition of magnon blockade is obtained. The numerical results with accessible experimental parameters demonstrate that under this global optimal condition, a perfect single‐magnon generator with a second‐order correlation function tends to zero and a higher single‐magnon number can be achieved even at ambient temperature up to 25 mK. The current scheme is proposed based on the lithographically scalable and superconducting circuit compatible design, which provides convenience for precisely and flexibly engineering in experiments. It is expected to be used as an integrated single‐quanta generator in quantum network.
We show that an atom can be coupled to a mechanical oscillator via quantum vacuum fluctuations of a cavity field enabling energy transfer processes between them. In a hybrid quantum system consisting of a cavity resonator with a movable mirror and an atom, these processes are dominated by two pair-creation mechanisms: the counterrotating (atom-cavity system) and dynamical Casimir interaction terms (optomechanical system). Because of these two pair-creation mechanisms, the resonant atom-mirror coupling is the result of high-order virtual processes with different transition paths well described in our theoretical framework. We perform a unitary transformation to the atom-mirror system Hamiltonian, exhibiting two kinds of multiple-order transitions of the pair creation. By tuning the frequency of the atom, we show that photon frequency conversion can be realized within a cavity of multiple modes. Furthermore, when involving two atoms coupled to the same mechanical mode, a single vibrating excitation of the mechanical oscillator can be simultaneously absorbed by the two atoms. Considering recent advances in strong and ultrastrong coupling for cavity optomechanics and other systems, we believe our proposals can be implemented using available technology.