Noise-Robust Ultrafast Entanglement Generation in Rydberg Atoms via Quantum Optimal Control

• URL: http://arxiv.org/abs/2604.12361v2
• Date: Tue, 21 Apr 2026 16:45:12 GMT
• Title: Noise-Robust Ultrafast Entanglement Generation in Rydberg Atoms via Quantum Optimal Control
• Abstract summary: We present a theoretical analysis of ultrafast entanglement generation between two Rydberg-blockaded atoms.<n>We evaluate Bell-state fidelity sensitivity to amplitude and phase noise across white, pink, and Ornstein-Uhlenbeck spectra.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a comprehensive theoretical analysis of ultrafast entanglement generation between two Rydberg-blockaded atoms, explicitly accounting for realistic laser noise. Using femtosecond Gaussian pulses as a baseline, we systematically evaluate Bell-state fidelity sensitivity to amplitude and phase noise across white, pink (1/f), and Ornstein-Uhlenbeck spectra using Monte Carlo ensemble simulations. Our results show that amplitude noise is well tolerated, with fidelities above 90% even at 30% noise levels, while phase noise is the primary limiting factor, causing fidelity to drop rapidly beyond about 1% noise amplitude. The spectral structure of the noise is also important: pink noise consistently causes less fidelity loss than white noise of the same amplitude. By applying quantum optimal control theory (QOCT) with the D-MORPH algorithm under multiple equality constraints, we obtain a double-pulse structure with a spectral notch that achieves approximately 99% fidelity in the noise-free case and maintains high fidelity under moderate amplitude noise. A breakdown threshold near 1% amplitude noise is identified, beyond which even optimized pulses cannot sustain coherent control. These results offer practical benchmarks for the development of ultrafast neutral-atom quantum processors operating in the femtosecond regime.

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