Magnon-mediated quantum gates for superconducting qubits

• DOI: 10.48550/arxiv.2406.14967
• Publication Date: 2024-06-21
• Authors: Martijn Dols; Sanchar Sharma; Lenos Bechara; Yaroslav M. Blanter; Marios Kounalakis; Silvia Viola Kusm...
• Keywords: Transmon; Magnon

We propose a hybrid quantum system consisting of magnetic particle inductively coupled to two superconducting transmon qubits, where qubit-qubit interactions are mediated via magnons. show that the can be tuned into three different regimes effective interactions, namely transverse ($XX + YY$), longitudinal ($ZZ$) and non-trivial $ZX$ interaction. In addition, we an enhanced coupling achieved by employing ellipsoidal magnet, carrying anisotropic fluctuations. scheme for realizing two-qubit gates, simulate their performance under realistic experimental conditions. find iSWAP CZ gates performed in this setup with average fidelity $\gtrsim 99 \% $ , while iCNOT gate applied 88 \%$. Our proposed circuit architecture offers alternative platform between qubits could employed constructing qubit networks using magnons as mediators.