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arXiv · 2504.06678

Geometric Quantum Gates of Non-closed Paths Under Counterdiabatic Driving

Ximo Wang·Hongyan Fan·Zhengqi Bai·Yichi Zhang
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Abstract

Non-adiabatic and non-closed evolutionary paths play a significant role in the fidelity of quantum gates. We propose a high-fidelity quantum control framework based on the quasi-topological number ($\nu_{\text{qua}}$), which extends the traditional Chern number to characterize geometric responses in non-closed paths. By introducing a counterdiabatic gauge potential (AGP) that dynamically suppresses non-adiabatic transitions and reconstructs path curvature, we demonstrate that $\nu_{\text{qua}}$ -a relative homotopy invariant of compact manifolds in parameter space-quantifies the robustness of geometric phases during open-path quantum evolution. This integer invariant ensures gauge-invariant suppression of decoherence errors arising from dynamical phase coupling. By introducing nonlinear parametric ring paths, we address the defects caused by intermediate states in the Rydberg atomic system. Numerical simulations in the Kitaev superconducting chain and 2D transverse-field Ising model confirm that our protocol achieves quantum gate fidelity exceeding $\mathcal{F} > 0.9999$. We bridges geometric quantum control with topological protection, offering a universal approach to noise-resistant quantum computing.

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Ximo Wang, Hongyan Fan, Zhengqi Bai, Yichi Zhang. 2025-04-09. Geometric Quantum Gates of Non-closed Paths Under Counterdiabatic Driving. https://doi.org/10.1063/5.0313675

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