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arXiv · 2608.20676

Continuous-angle logical rotations in the Steane code

Eric Huang·Daiwei Zhu·Matteo Ippoliti·Christopher Monroe·Michael J. Gullans
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Abstract

We experimentally demonstrate continuous-angle logical $Z$ rotations in the $[[7,1,3]]$ Steane code on the IonQ Forte trapped-ion processor. A round of the protocol applies a transversal physical $Z$ rotation by $\theta$, followed by Steane syndrome extraction and decoding, which induces a syndrome-dependent logical $Z$ rotation. We analytically derive the effect of dephasing noise on the logical rotation angle and logical dephasing rate. Using logical Ramsey interferometry, we observe coherent syndrome-dependent logical rotations from a single round of the protocol. We find that the logical channel reconstructed from process tomography is a noisy logical $Z$ rotation well explained by a dephasing model. We further implement a two-round protocol applying physical rotations $+\theta$ and $-\theta$, and observe cancellation of the total logical angle with low logical dephasing for repeated trivial syndromes. This constitutes a proof-of-principle demonstration of continuously tunable non-Clifford logical gates by transversal rotations and standard error correction in a small quantum code.

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Eric Huang, Daiwei Zhu, Matteo Ippoliti, Christopher Monroe, Michael J. Gullans. 2026-08-21. Continuous-angle logical rotations in the Steane code. https://arxiv.org/abs/2608.20676

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