Nonreciprocal Transmission and Nonreciprocal Entanglement in a Spinning Microwave Magnomechanical System

• Published in: Annalen der Physik 2020-09, Vol.532 (9), p.n/a
• Main Authors: Yang, Zhi‐Bo, Liu, Jin‐Song, Zhu, Ai‐Dong, Liu, Hong‐Yu, Yang, Rong‐Can
• Format: Article
• Language: English
• Subjects: Entanglement; Fizeau shift; Isolators; Magnons; magnon–phonon entanglement; nonreciprocal systems; Phonons; Photons; spinning microwave magnomechanical systems; Yttrium; Yttrium-iron garnet
• ISSN: 0003-3804; 1521-3889
• DOI: 10.1002/andp.202000196

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. In this paper, a scheme to realize nonreciprocal entanglement and nonreciprocal transmission is proposed. This work shows excellent application prospects in quantum information processing, either for quantum transducers or quantum memory. Nonreciprocal magnon–phonon entanglement provides a new way of thinking of quantum information processing, and the magnons can be used for information storage.