Enhancement of superconducting pairing via quantum Lyapunov control

Oleksandr Povitchan; Denys I. Bondar; Andrii G. Sotnikov

doi:10.1103/7dz3-2wlk

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Enhancement of superconducting pairing via quantum Lyapunov control

Oleksandr Povitchan, Denys I. Bondar, Andrii G. Sotnikov

DOI 10.1103/7dz3-2wlk · Physical Review A

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Abstract

We demonstrate that quantum Lyapunov control provides an effective strategy for enhancing superconducting correlations in the Fermi-Hubbard model without requiring careful parameter tuning. While photoinduced superconductivity is sensitive to the frequency and amplitude of a monochromatic laser pulse, our approach employs a simple feedback-based protocol that prevents the decrease of superconducting correlations once they begin to form. This method enables robust enhancement of pairing across a broad range of initial pumping conditions, eliminating the need for intricate frequency and amplitude optimization. We also show that an alternative implementation, asymptotic quantum control, achieves comparable results. Furthermore, our approach can be adapted to suppress previously induced superconducting correlations, providing bidirectional control over quantum pairing states. These findings suggest practical pathways for manipulating quantum correlations in strongly interacting systems with minimal experimental complexity.