We demonstrate a robust quantum control framework that enables high-fidelity gate operations in semiconductor spin qubit systems with always-on couplings. Always-on interactions between qubits pose a fundamental challenge for quantum processors by inducing correlated errors that can trigger chaotic dynamics. Our approach suppresses both static coupling noise and time-dependent crosstalk without requiring high on/off ratio tunable couplers. Significantly, these pulses also prevent the emergence of chaotic entanglement growth in deep quantum circuits, preserving coherence in large multi-qubit systems. By relaxing hardware constraints on coupling control, our method provides a practical path toward scaling semiconductor quantum processors within existing fabrication capabilities, with particular relevance for silicon spin qubit architectures where high-contrast coupling modulation remains challenging.
@article{arxiv.2503.12795,
title = {Scalable Robust Quantum Control for Semiconductor Spin Qubits with Always-on Couplings},
author = {Yong-Ju Hai and Shihang Zhang and Haoyu Guan and Peihao Huang and Yu He and Xiu-Hao Deng},
journal= {arXiv preprint arXiv:2503.12795},
year = {2025}
}