Scalable Robust Quantum Control for Semiconductor Spin Qubits with Always-on Couplings

• URL: http://arxiv.org/abs/2503.12795v1
• Date: Mon, 17 Mar 2025 04:03:31 GMT
• Title: Scalable Robust Quantum Control for Semiconductor Spin Qubits with Always-on Couplings
• Authors: Yong-Ju Hai, Shihang Zhang, Haoyu Guan, Peihao Huang, Yu He, Xiu-Hao Deng,
• Abstract summary: We demonstrate a robust quantum control framework that enables high-fidelity gate operations in semiconductor spin qubit systems with always-on couplings.<n>Our approach suppresses both static coupling noise and time-dependent crosstalk without requiring high on/off ratio tunable couplers.
• Score: 5.417763860308844
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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