ZZ-Free bSWAP Gates under Strong Driving in Far-Detuned Fixed-Frequency Transmons

Authors:Akinori Machino, Kazuhisa Ogawa, Yuto Ikegai, Takafumi Miyanaga, Koichiro Ban, Nilton F. G. Filho, Hidehisa Shiomi, Toshi Sumida, Shuhei Tamate, Yutaka Tabuchi, Yasunobu Nakamura, Makoto Negoro

Abstract:Far-detuned frequency allocations in fixed-frequency superconducting processors mitigate spectral crowding but constrain cross-resonance interactions at practical drive amplitudes. Here, we demonstrate that a single strong drive induces a large $XX-YY$ interaction in the far-detuned regime, while a weak second tone tunes the accompanying $ZZ$ phase. The interaction realizes a 150-ns $\sqrt{\mathrm{bSWAP}}$ gate, which can directly prepare a maximally entangled state from the ground state. For the implementations on the same qubit pair at matched drive strengths, cross resonance gives a shorter CNOT operation, while $\sqrt{\mathrm{bSWAP}}$ gives a 33% shorter SWAP operation with a higher IRB fidelity. The multilevel theory further predicts a regime where stronger driving can yield a speed advantage for CNOT as well, a possibility absent in the two-level model. As an application of the $XX-YY$ interaction, we also demonstrate two-spin squeezing beyond the standard quantum limit through two-axis countertwisting. The interaction realized here complements cross resonance and offers a route to efficient gate synthesis and quantum simulation of interacting spin systems.

arXiv:2610.21936 [quant-ph]

(or arXiv:2610.21936v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2610.21936 arXiv-issued DOI via DataCite (pending registration)