Effect of Stochastic Charge Noise in Si/SiGe Quantum-Dot Spin Qubits

• URL: http://arxiv.org/abs/2510.22189v1
• Date: Sat, 25 Oct 2025 06:52:14 GMT
• Title: Effect of Stochastic Charge Noise in Si/SiGe Quantum-Dot Spin Qubits
• Authors: Wei-en Chiu, Chia-Hsien Huang, Yi-Hsien Wu, Hsi-Sheng Goan,
• Abstract summary: In Si/SiGe quantum dots, the decoherence behavior of spin qubits usually comes from the non-Markovian effect of the charge noise.<n>We propose a spin-phonon model to characterize the decoherence behavior of the spin qubit in a Si/SiGe quantum dot.<n>We show that our optimized control pulse can substantially reduce the error contribution of the incoherent non-Markovian 1/f charge noise.
• Score: 1.4169475278597459
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In Si/SiGe quantum dots, the decoherence behavior of spin qubits usually comes from the non-Markovian effect of the charge noise. To improve the performance of using the coherent noise models in the decoherence simulation and tomography analysis, here we propose a spin-phonon model derived from the electric dipole spin resonance to characterize the decoherence behavior of the spin qubit in a Si/SiGe quantum dot. Utilizing a 1/f spectrum to characterize quantum noise correlation, our stochastic model can yield a more precise prediction of decoherence compared to a random coherence model. We also use gate set tomography (GST) to address the error generator and analyze the model violation coming from the non-Markovian effect. Based on the results, we attribute certain error generators of this model to the incoherence error, which avoids the scenario of using too large a coherent noise strength in the previous study to account for the experimentally observed decoherence times, and thus underestimates the gate fidelity. We also perform a gate optimization and show that our optimized control pulse can substantially reduce the error contribution of the incoherent non-Markovian 1/f charge noise. We further demonstrate that the optimized pulse against incoherent noise is more robust against coherent noise than the regular Gaussian pulse through a filter function analysis in a CPMG protocol, demonstrating the significant effectiveness of the optimized pulse.

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