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Chinese Physics B

Tunable magnon blockade in a magnon-qubit system with coherent and parametric driving

Yuchen Liu, Binhui Chang, Cong Cui, Xinping Li, Hongzhi Shen, Xiaofeng Duan, Junhua Hou, Tianze Luan, Wenyao Hu

Published Oct 19, 2026• 0 citations
Publisher

Abstract

Abstract We study the magnon antibunching effect in the magnon-qubit coupling system under the joint action of coherent and parametric drives. The analysis and numerical results reveal the conventional magnon blockade (CMB) caused by the anharmonic level splitting induced by strong magnon–qubit coupling and the unconventional magnon blockade (UMB) induced by multipath destructive interference. Notably, in the strong-coupling regime, substituting the CMB condition into the optimal UMB condition yields a phase-tuned CMB-constrained UMB condition, which simultaneously realizes strong magnon antibunching and a high single-magnon occupation probability. This combines the high brightness afforded by CMB with the high purity provided by UMB. Furthermore, in the weak-coupling regime, coordinated tuning of the phase, detuning, parametric drive, and coupling strength induces destructive interference among distinct excitation pathways, thereby yielding the UMB effect. Importantly, even in the zero-coupling limit, the additional channel provided by the parametric drive can sustain this blockade. This flexibility removes the reliance on stringent strong-coupling constraints, offering a viable route toward tunable strong magnon antibunching.

DOI
10.1088/1674-1056/aeb5cc

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Abstract We study the magnon antibunching effect in the magnon-qubit coupling system under the joint action of coherent and parametric drives. The analysis and numerical results reveal the conventional magnon blockade (CMB) caused by the anharmonic level splitting induced by strong magnon–qubit coupling and the unconventional magnon blockade (UMB) induced by multipath destructive interference. Notably, in the strong-coupling regime, substituting the CMB condition into the optimal UMB condition yields a phase-tuned CMB-constrained UMB condition, which simultaneously realizes strong magnon antibunching and a high single-magnon occupation probability. This combines the high brightness afforded by CMB with the high purity provided by UMB. Furthermore, in the weak-coupling regime, coordinated tuning of the phase, detuning, parametric drive, and coupling strength induces destructive interference among distinct excitation pathways, thereby yielding the UMB effect. Importantly, even in the zero-coupling limit, the additional channel provided by the parametric drive can sustain this blockade. This flexibility removes the reliance on stringent strong-coupling constraints, offering a viable route toward tunable strong magnon antibunching.
We explore a scheme to investigate the tunable magnon antibunching characteristics of the conventional magnon blockade (CMB) and the unconventional magnon blockade (UMB) in a hybrid ferromagnet-superconductor system. The magnon excited in the yttrium iron garnet is indirectly coupled to two qubits by eliminating two mutually perpendicular microwave cavity modes. In our paper, we relax the magnon-qubits detuning constraint. In two cases with and without magnon-qubits detuning, it is found that in the strong coupling regime CMB and UMB coexist in our system, and they can be regulated simultaneously by varying the magnon-qubits coupling strength ratio and the qubits detuning ratio. In the weak coupling regime, there exists only the UMB in the system. Without magnon-qubits detuning, the UMB shows a nonmonotonic dependence on the magnon-qubits coupling strength ratio. With magnon-qubits detuning, for the UMB, the magnon bunching effect and antibunching effect can be converted mutually by adjusting the magnon-qubits coupling strength ratio and the qubits detuning ratio. Moreover, changing the magnon-qubits coupling strength ratio and the qubits detuning ratio has a significant impact on the antibunching effect against the thermal magnon excitation. Our research results provide a theoretical scheme for the manipulation of magnon antibunching characteristics, and have important practical significance for the construction of a single magnon source.
Abstract Magnon blockade is one of the effective methods for realizing single magnon sources which have great potential application in quantum information processing and quantum computing. To enhance single-magnon blockade effect, we introduce a two-magnon driving to the magnomechanical system, which is used to form the multipath destructive interference. Our result shows that both the conventional magnon blockade (CMB) and unconventional magnon blockade (UMB) can be achieved due to nonlinear term of the magnon-mechanical oscillator and magnetic parametric amplification term(MPA) induced by two-magnon driving. By setting certain parameters of MPA, we combine the effect of CMB and UMB. As a result, the single-magnon blockade effect is enhanced, and the disadvantage of rapid oscillations of the time-delay second-order correlation function g (2)(τ) with UMB is overcome, which makes high time resolution not necessary in the detection of second-order correlation function.
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.
We propose to achieve and enhance the magnon blockade effect in an optomechanical-magnetic system based on a quantum destructive interference mechanism between three indirect transition pathways. By introducing a degenerate parametric amplifier, we analytically obtain the optimal parametric gain and phase for achieving the magnon blockade. Under the optimized parameter conditions, the driving detunings of cavity and magnon modes can be flexibly controlled to achieve the smallest second-order magnon correlation function. Moreover, the magnon blockade can exhibit fascinating features by proper driving detuning and weaker driving strength. Our scheme combines the benefits of destructive interference-induced magnon blockade and energy-level anharmonicity-induced magnon blockade, which results in a reduction of equal-time second-order magnon correlation while simultaneously avoiding time-delay second-order magnon correlation with rapid oscillation. Our work provides an alternative and experimentally feasible platform for manipulating few-magnon states and generating single-magnon sources.
We investigate magnon–photon pair antibunching in a cavity optomagnonic system, in which a yttrium iron garnet sphere simultaneously supports two optical modes and a magnon mode and is driven by squeezed light and coherent light. The results illustrate that by applying squeezed light, the conventional magnon–photon pair blockade (CMPPB) originating from anharmonic energy levels and the unconventional magnon–photon pair blockade (UMPPB) induced by destructive quantum interference can coexist in the same platform. Both blockade effects can be flexibly tuned by the driving detuning and the optomagnonic coupling strength. Within the explored parameter regime, the UMPPB exhibits a nontrivial dependence on the driving strengths of coherent light and squeezed light, and bunching regions may also appear. These results provide a tunable framework for controlling magnon–photon pair antibunching, which may be useful for the generation and manipulation of hybrid nonclassical states in cavity optomagnonic systems.
In this work, we study the phenomena of quantum-interference-assisted magnon blockade and magnon antibunching in a weakly interacting hybrid ferromagnet-superconductor system. The magnon excitations in two yttrium iron garnet spheres are indirectly coupled to a superconducting qubit through microwave cavity modes of two mutually perpendicular cavities. We find that when one of the magnon modes is driven by a weak microwave field, the destructive interference between more than two distinct transition pathways restricts the simultaneous excitation of two magnons. We analyze the magnon correlations in the driven magnon mode for the case of zero detunings as well as finite detunings of the magnon modes and the qubit. We show that the magnon antibunching can be tuned by changing the magnon-qubit coupling strength ratio and the driving detuning. Our work proposes a possible scheme that has a significant role in the construction of single magnon generating devices.