https://doi.org/10.1140/epja/s10050-023-01108-2
Regular Article –Theoretical Physics
Control optimization for parametric Hamiltonians by pulse reconstruction
1
Physics Department, University of Trento, Via Sommarive 14, 38123, Trento, Italy
2
INFN-TIFPA Trento Institute of Fundamental Physics and Applications, Via Sommarive, 14, 38123, Trento, Italy
3
Lawrence Livermore National Laboratory, P.O. Box 808, L-414, 94551, Livermore, California, USA
4
Institute of Nuclear Theory (INT), University of Washington, Physics-Astronomy Building, Box 351550, 98195-1550, Seattle, WA, USA
Received:
6
January
2023
Accepted:
9
August
2023
Published online:
1
September
2023
Optimal control techniques provide a means to tailor the control pulses required to generate customized quantum gates, which helps to improve the resilience of quantum simulations to gate errors and device noise. However, the significant amount of (classical) computation required to generate customized gates can quickly undermine the effectiveness of this approach, especially when pulse optimization needs to be iterated. We propose a method to reduce the computational time required to generate the control pulse for a Hamiltonian that is parametrically dependent on a time-varying quantity. We use simple interpolation schemes to accurately reconstruct the control pulses from a set of pulses obtained in advance for a discrete set of predetermined parameter values. We obtain a reconstruction with very high fidelity and a significant reduction in computational effort. We report the results of the application of the proposed method to device-level quantum simulations of the unitary (real) time evolution of two interacting neutrons based on superconducting qubits.
© The Author(s) 2023
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