Nonreciprocal Transmission and Nonreciprocal Entanglement in a Spinning Microwave Magnomechanical System

Abstract

This study presents nonreciprocal transmission and nonreciprocal magnon–phonon entanglement in a spinning microwave magnomechanical system. This system consists of microwave photons, magnon modes, and phonons. These are created by the vibrational mode of a yttrium iron garnet sphere. This investigation reveals that nonreciprocity is caused by the light that is circulating in a resonator that is experiencing a Fizeau shift. This leads to a difference in the effective detuning frequency of the photon for forwarding and backward drives. A super‐strong transmission isolation rate (>100 dB) and a strong entanglement isolation rate (≈50 dB) are obtained by applying the experimental parameters. This scheme opens a new route for exploiting a variety of nonreciprocal effects, and it provides the theoretical basis for the design and realization of magnetically controllable isolators and diodes.

Nonreciprocal Transmission and Entanglement in a cavity-magnomechanical system

“…Next, the difference between subsystem entanglement with forward driving direction and backward driving direction is extracted in the decibel scale (defined as 20 × log 10 |E ij,12 /E ij,21 |, similar to T iso [3]), and we take its value as the entanglement isolation ratio E ij,iso (units of dB). For the case of reciprocal subsystem entanglement, we have E ij,12 /E ij,21 = 1 and E ij,iso = 0.…”

“…Although reciprocity is ubiquitous in nature, nonreciprocity promptes diverse applications such as chiral engineering, invisible sensing, and backaction-immune information processing [1][2][3]. So far, electromagnetic nonreciprocal transmission [4,5] has been demonstrated with various systems ranging from microwave [6][7][8][9], terahertz [10], optical [11,12] photons to x-rays [13].…”

Optical sensing of magnons via the magnetoelastic displacement

“…We consider the situation where the frequency of the phonon mode is much lower than that of the magnon mode [9,22,23], such that they couple via a radiation pressure-like dispersive interaction. Such a nonlinear coupling has been recognized as a cornerstone of many quantum protocols [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Relevant experiments have demonstrated magnomechanically induced transparency/absorption [22] and mechanical cooling/lasing [23].…”

Dynamical backaction magnomechanics and its evasion

“…1. The coupling between mechanical vibrations and the hybrid cavity-magnon modes, particularly when under the so-called triple-resonance condition, where mechanical mode frequency matches the difference between the hybrid modes has sparked great interest and led to proposals for the generation of nonclassical entangled states, [2][3][4][5][6][7] squeezed states, [8][9][10] classical and quantum information processing, [11][12][13][14][15] quantum correlation thermometry, 16 and exploring PT symmetry. [17][18][19][20] Magnons [21][22][23] have been demonstrated to impart a radiation pressure-like force on the mechanical vibrations of the magnetized material, 1,24,25 in analogy to the field of cavity optomechanics 26 where photons interact with mechanical degrees of freedom.…”