Entanglement enhancement in cavity magnomechanics by an optical parametric amplifier

Squeezed States of Magnons and Phonons in a Cavity Magnomechanical System with a Microwave Parametric Amplifier

“…It is noted that a degenerate PA can be used to enhance the bipartite and tripartite entanglement in a cavity magnomechanical system, [ 21 ] in which the pump frequency of the PA is taken to be twice the frequency ω 0 of the magnon drive. In contrast, we use a degenerate PA to generate the steady‐state squeezed states of the magnon and phonon modes in a cavity magnomechanical system, and the pump frequency of the PA is chosen to be twice the resonance frequency $$\omega _{a}$$ of the cavity mode.…”

“…Meanwhile, the magnon mode is coupled to the DOI: 10.1002/andp.202300095 phonon mode in the YIG sphere via the magnetostrictive force, [1] resembling the radiation pressure force in a cavity optomechanical system. [10,11] In such systems, a wealth of phenomena have been observed, including magnetically induced transparency, [4] magnon dark modes, [12] self-sustained oscillations, [13] the phase transition at the exceptional point, [14] the bistability, [15][16][17] the Kerr effect of magnons, [18] the entanglement between the cavity, magnon, and phonon modes, [19][20][21][22][23][24] the entanglement between two magnon modes, [25,26] ternary logic gate, [27] magnon-induced nonreciprocity, [28] slow light, [29] quantum amplification of spin currents, [30] magnon-induced dynamical backaction, [31] and dynamical backaction evasion. [32] The squeezed state of a harmonic oscillator has less variance in one quadrature than that of its vacuum state, which indicates the reduction of quantum noise in that quadrature.…”

“…[50][51][52] The cavity magnomechanical system with a macroscopic YIG sphere is a good candidate to prepare the macroscopic quantum states due to the magnon-cavity interaction and the magnon-phonon interaction. [19][20][21][22][23][24][25][26]53,54] It has been shown that the squeezed states of the magnon and phonon modes in a cavity magnomechanical system can be generated via the injection of a squeezed vacuum field into the microwave cavity [53] and using two-tone microwave fields. [54] In this paper, we theoretically show how it is possible to achieve the steady-state squeezed states of the magnon and phonon modes in a cavity magnomechanical system by placing a degenerate microwave PA inside the microwave cavity.…”

Generation and manipulation of phonon lasering in a two-drive cavity magnomechanical system

“…In this system, deformation modes in the YIG sphere are utilized as mechanical modes, and a magnon mode couples simultaneously with a microwave cavity mode and a phonon mode through magnetic-dipole interaction and magnetostrictive interaction, respectively. Such a platform of cavity magnomechanics, in analogy to cavity optomechanics, can further be used to explore a large diversity of effects, such as multipartite entanglement [59][60][61][62], controllable transmission [63][64][65], squeezed states [66,67], high-order sidebands [68,69], magnon nonlinearities [70,71], ground state cooling [72], quantum steering [73,74], exceptional points [75], and phonon lasering [76][77][78].…”

Reservoir Engineering Strong Magnomechanical Entanglement via Dual‐Mode Cooling

“…[37] Hussain et al showed that bipartite and tripartite entanglement also can be enhanced by adding an optical parametric amplifier to the standard cavity magnomechanical system. [38] However, the stationary entanglement achievable via this reservoir engineering approach can exceed the limit of entanglement obtained by the coherent two-mode squeezing interaction due to the stability constraints of the continuous variable (CV) system. [39][40][41] In addition, reservoir engineering is independent of the initial state of the system and is robust to decoherence, which enables one to create and verify entanglement experimentally.…”