Directional emission of a broadband squeezed microwave field

作     者：Rong-teng Cao Ji-kun Xie Ya-long Ren Shao-yan Gao 

作者机构：MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices School of Physics Xi'an Jiaotong University Xi'an 710049 China 

出 版 物：《Physical Review A》 (Phys. Rev. A)

年 卷 期：2025年第111卷第2期

页      面：023701-023701页

核心收录：

基　　金：National Natural Science Foundation of China, NSFC, (11704306, 12447187) National Natural Science Foundation of China, NSFC Shaanxi Fundamental Science Research Project of Mathematics and Physics, (22JSY005) CPSF, (GZC20241373) Natural Science Foundation of Shaanxi Province, (2024JC-YBMS-031) Natural Science Foundation of Shaanxi Province 

主　　题：Photons 

摘      要：Broadband squeezed light is a valuable resource in the quantum information science community. Here, we propose an appealing method for the directional generation of broadband microwave squeezing based on hybrid magnonics, where multiple chiral cavity-magnonic subsystems are connected together through a bidirectional waveguide in a cascading way. The chirality arises from the selective coupling between the Kittel mode in the ferrimagnetic yttrium iron garnet sphere and one of the two degenerate counter-rotating microwave modes in a ring-shaped cavity. By introducing Floquet engineering to simultaneously induce red and blue sidebands in the photon-magnon coupling, the chiral squeezing-type interaction can be engineered in each cavity-magnonic subsystem. Considering all the photon-magnon couplings in the cascaded system with the same chirality, we show that a broadband squeezed microwave field can be emitted on demand to either of the two output ports along the waveguide. Compared with a single chiral cavity-magnonic system, both the squeezing amount and the bandwidth can be significantly enhanced through the cumulative effect of the cascaded system.