Coherence-protected operations in hybrid superconducting circuit-magnon system

• Published in: Chinese physics B Vol. 34; no. 3; pp. 30302 - 30308
• Main Authors: Zhu, Le-Tian, Zhu, Xing-Yu, Yue, Zhu-Cheng, Tu, Tao, Li, Chuan-Feng
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.03.2025
• Subjects: circuit QED; entanglement production; quantum information with hybrid systems
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/ada550

Hybrid systems consisting of superconducting circuits and magnon systems are a promising platform for quantum technology. However, realizing high-fidelity magnon state preparation and manipulation remains an outstanding challenge due to the complexity of interactions and noise sources in hybrid systems. Here, we propose a coherence-preserving magnon state manipulation scheme. By engineering a superconducting-magnon coupling pulse and combining it with dynamical decoupling pulses, we design a composite pulse sequence. We demonstrate the manipulation and preparation of non-classical states of magnons with a fidelity of up to 98% under realistic conditions. These designs significantly improve the fidelity of manipulation and robustness to noise in hybrid systems compared to existing schemes. These results pave the way for practical applications of quantum magnonics platforms.