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Results in Physics

Chirally-symmetric-like unconventional magnon blockade in a dissipative cavity-magnon system

Long‐Jiang Cong, Yi‐Xiong Luo, Zhipeng Cheng, Rong‐Bo Du, Hong‐Yu Liu, Rong‐Can Yang, Ying Ming

Published Oct 30, 2024• 4 citations
Publisher

Abstract

We present a theoretically versatile and controllable framework for realizing chirally-symmetric-like unconventional magnon blockade within a cavity-magnon system composed of a yttrium iron garnet sphere and a cross-line microwave circuit, where the cavity mode is driven by a two-photon driving field. Under optimal conditions regarding the driving strength and phase of this two-photon field, we observe that magnon blockade exhibits chiral-like symmetry even in high-dissipation scenarios. However, the introduction of coherent coupling leads to energy level splitting that counteracts the energy level attraction induced by dissipative coupling, thereby diminishing the blockade effect. Furthermore, we clarify that the energy level attraction resulting from dissipative coupling remains invariant with respect to variations in the phase of this coupling coefficient. Our approach offers promising applications for tunable single-magnon sources and quantum information processing. • A versatile and controllable framework for realizing chirally-symmetric-like unconventional magnon blockade is investigated theoretically. • Under optimal conditions regarding the driving strength and phase of this two-photon field, magnon blockade exhibits chiral-like symmetry even in high-dissipation scenarios. • The introduction of coherent coupling leads to energy level splitting that counteracts the energy level attraction induced by dissipative coupling. • The energy level attraction resulting from dissipative coupling remains invariant with respect to variations in the phase of this coupling coefficient. • There are promising applications for tunable single-magnon sources and quantum information processing.

DOI
10.1016/j.rinp.2024.108023

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We present a theoretically versatile and controllable framework for realizing chirally-symmetric-like unconventional magnon blockade within a cavity-magnon system composed of a yttrium iron garnet sphere and a cross-line microwave circuit, where the cavity mode is driven by a two-photon driving field. Under optimal conditions regarding the driving strength and phase of this two-photon field, we observe that magnon blockade exhibits chiral-like symmetry even in high-dissipation scenarios. However, the introduction of coherent coupling leads to energy level splitting that counteracts the energy level attraction induced by dissipative coupling, thereby diminishing the blockade effect. Furthermore, we clarify that the energy level attraction resulting from dissipative coupling remains invariant with respect to variations in the phase of this coupling coefficient. Our approach offers promising applications for tunable single-magnon sources and quantum information processing. • A versatile and controllable framework for realizing chirally-symmetric-like unconventional magnon blockade is investigated theoretically. • Under optimal conditions regarding the driving strength and phase of this two-photon field, magnon blockade exhibits chiral-like symmetry even in high-dissipation scenarios. • The introduction of coherent coupling leads to energy level splitting that counteracts the energy level attraction induced by dissipative coupling. • The energy level attraction resulting from dissipative coupling remains invariant with respect to variations in the phase of this coupling coefficient. • There are promising applications for tunable single-magnon sources and quantum information processing.
We investigate unconventional magnon blockade (UMB) in a dissipative photon–magnon coupling cavity, where the coherent and dissipative coupling between photon and magnon can be adjusted by the position of the yttrium iron garnet sphere in the cavity. An approximate analytical solution for the statistical property of magnon is provided, which is in good agreement with the results obtained by numerically solving the Lindblad master equation. Our results indicate that UMB can be achieved in the case of dissipative photon–magnon coupling, but not in the case of coherent photon–magnon coupling. Secondly, by adjusting the amplitude of the external laser field, dynamic control of UMB can be achieved. Finally, by solving the Lindblad master equation containing the occupation number of thermal magnon and photon, the statistical properties of magnons will transition from nonclassical to classical. It is shown that the above phenomena originate from the interference between different quantum paths. Our research may provide theoretical possibilities for quantum manipulation schemes at the single-magnon level and open up a new avenue for designing single-magnon sources in a dissipative photon–magnon coupling system. • UMB can be generated by dissipative photon–magnon coupling, not coherent coupling. • The analytical optimal parameter for UMB is in agreement with the numerical result. • Dynamic-controlled UMB can be achieved by adjusting the external laser fields.
ABSTRACT We focus on the magnon blockade phenomenon in a non‐Hermitian cavity magnonics system with dissipative magnon–photon coupling. The system consists of a cross‐shaped microwave circuit supporting both standing and traveling waves and a yttrium iron garnet sphere supporting a magnon mode, where the dissipative coupling between the magnon mode and the standing wave cavity mode is caused by the traveling wave, forming the non‐Hermitian cavity magnonics system. For the non‐Hermitian system with the pure dissipative coupling, we find that, by driving the microwave cavity mode using the two‐photon driving field, the magnon blockade phenomenon can occur due to the destructive interference of the transition paths. More excitingly, when the non‐Hermitian cavity magnonics system is set as an anti‐parity‐time ()‐symmetry system, the optimal magnon blockade phenomenon occurs near the exceptional points (transition points from the unbroken‐ to broken‐anti‐ symmetry). Then we analyze the influence of the driving strength on the magnon blockade, and give the optimal driving strength. The presented work not only provides an alternative method for the magnon blockade, but also can promote the study of the quantum effects in the non‐Hermitian cavity magnonics system.
We propose an scheme for directional single-photon source based on a chiral cavity-magnon system. In this system, the magnon mode in a single-crystal yttrium iron garnet (YIG) sphere is coupled to only one of two rotating microwave modes in the torus-shaped microwave cavity. When two-photon drives are applied to both ports of the waveguide, the chiral cavity-magnon coupling leads to an unconventional photon blockade in one propagation direction, resulting in directional single-photon emission. The emission direction of the single-photon source can be controlled by reversing the biased magnetic field. Furthermore, we further examine the effects of imperfect chiral cavity-magnon coupling and the coupling between the two cavity modes on the photon blockade behavior. The results show that the system retains robustness in the presence of these nonideal factors, and the unidirectional photon blockade effect remains clearly preserved.
Abstract Nonreciprocal devices, allowing to manipulate one‐way signals, are crucial to quantum information processing and quantum networks. Here a nonlinear cavity‐magnon system is proposed, consisting of a microwave cavity coupled to one or two yttrium–iron–garnet (YIG) spheres supporting magnons with Kerr nonlinearity, to investigate nonreciprocal unconventional photon blockade. The nonreciprocity originates from the direction‐dependent Kerr effect, distinctly different from previous proposals with spinning cavities and dissipative couplings. For a single sphere case, nonreciprocal unconventional photon blockade can be realized by manipulating the nonreciprocal destructive interference between two active paths, via varying the Kerr coefficient from positive to negative, or vice versa. By optimizing the system parameters, the perfect and well‐tuned nonreciprocal unconventional photon blockade can be predicted. For the case of two spheres with opposite Kerr effects, only reciprocal unconventional photon blockade can be observed when two cavity‐magnon coupling strengths Kerr strengths are symmetric. However, when coupling strengths or Kerr strengths become asymmetric, nonreciprocal unconventional photon blockade appears. This implies that two‐sphere nonlinear cavity‐magnon systems can be used to switch the transition between reciprocal and nonreciprocal unconventional photon blockades. This study offers a potential platform for investigating the nonreciprocal photon blockade effect in nonlinear cavity magnonics.
Unidirectional photon emission is crucial for constructing quantum networks and realizing scalable quantum information processing. In the present work an efficient scheme is developed for the unidirectional emission of a tunable squeezed microwave field. Our scheme is based on a chiral cavity magnonic system, where a magnon mode in a single-crystalline yttrium iron garnet (YIG) sphere is selectively coupled to one of the two degenerate rotating microwave modes in a torus-shaped cavity with the same chirality. With the YIG sphere driven by a two-color Floquet field to induce sidebands in the magnon-photon coupling, we show that the unidirectional emission of a tunable squeezed microwave field can be generated via the assistance of the dissipative magnon mode and a waveguide. Moreover, the direction of the proposed one-way emitter can be controlled on demand by reversing the biased magnetic field. Our work opens up an avenue to create and manipulate one-way nonclassical microwave radiation field and could find potential quantum technological applications.
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.