Magnon Blockade and Magnon–Atom Entanglement Induced by a Qutrit Coupled to a Ferromagnetic YIG Sphere

Abstract

Hybridized magnonic-photonic systems promise novel applications for future information processing technologies. Here, a hybrid magnonic system comprising of a qutrit (𝚲-type three-level atom) and a ferromagnetic YIG sphere is considered. Indeed, the whole system is driven by two light fields under the influence of the thermal environment. The indirect magnon-atom interaction is established via the virtual photon exchange. The associated Lindblad master equation is derived and its solution is found to investigate the nonclassical feature, especially in the steady-state solution. Generally, the system shows considerable nonclassicality, that is, strong magnon antibunching and magnon blockade. In fact, the feasibility of using such a hybrid system to prepare a single-magnon source based on magnon blockade effects we theoretically demonstrated. Besides, the considered system may be exploited to generate robust and stable magnon-atom entanglement. The appearance of magnon blockade and magnon-atom entanglement in the 𝚲-type atom may have its origin in the fact that the atom is trapped in different superposition states, induced by the quantum interference phenomenon. The proposed model and the corresponding results may open up an intriguing prospect to prepare a single-magnon source and provide further benefits through concatenating with photons in optomagnonic systems.

Enhanced magnon blockade in a magnomechanical system

“…Similar to photon blockade and phonon blockade [36][37][38][39][40][41][42][43][44][45][46][47], magnon blockade as a typical quantum phenomenon, will also play an important role in studying the characteristics of magnomechanical systems [14,[48][49][50][51][52]. For single-magnon blockade, its definition is exciting the first magnon in the system suppresses subsequent magnon excitations, resulting in the anti-bunching effect of magnons.…”

Magnon-magnon entanglement generation between two remote interaction-free optomagnonic systems via optical Bell-state measurement

“…Hybrid quantum systems are flexible platforms that enable the combination of distinct physical systems with complementary characteristics [1][2][3][4][5][6][7][8]. In particular, the hybrid magnonic systems are highly promising for many short-and long-term applications in quantum technologies, including quantum sensing [9], quantum communication [10,11], quantum teleportation [12,13], quantum simulation [14,15],quantum information [16,17] and quantum computing [18][19][20].…”