Absorption of magnons in dispersively coupled hybrid quantum systems
Zeng‐Xing Liu, Hao Xiong, Muying Wu, Yong-qing Li
Abstract
Phenomena involved in magnons have attracted extensive attention for several decades because of their challenging physical properties, powerful capabilities, and potential applications in signal processing in the microwave frequency range. In this work study we study the steady-state dynamic processes of a hybrid quantum system based on magnonics, where the magnon mode couples dispersively to a superconducting qubit. We find that the dispersive coupling between the qubit and magnons causes the system to be bistable and we discuss in detail an interesting phenomenon of dispersive-coupling-induced absorption of magnons. Furthermore, a feasible scheme to measure the qubit-magnon dispersive shift by employing the absorption curves of the probe field is proposed. The results presented here are of great significance to the investigation of the steady-state dynamic behaviors of quantum magnonics in a strong-dispersive regime and may provide a theoretical reference for the realization of quantum sensing of magnons.