Work

Fidelity-enhanced variational quantum optimal control

Year: 2025

Type: article

Abstract: Creating robust quantum operations is a major challenge in the current noisy intermediate-scale quantum computing era. Recently, the importance of noise-resilient control methods has become more pronounced in the field. Ordinarily, noisy quantum systems are described by the Lindblad equation. However, minimizing noise susceptibility using this equation has proven challenging because of its irreversibility. In this study, we propose a method for creating robust pulses based on the stochastic Schr\"odinger equation. This equation describes individual noise realizations under any colored noise process, contrary to the Lindblad equation, which describes mean system behavior under white noise. Using stochastic optimal control techniques, our method, fidelity-enhanced variational quantum optimal control, is able to construct higher-fidelity paths than its nonstochastic counterpart. By accounting for both environmental noise sources as well as noise sources inherent to the control system, highly significant increases in fidelity are noted for both single- and multiple-qubit state preparations.

Source: Physical Review A

DOI: 10.1103/physreva.111.052625

Authors: R. J. P. T. de Keijzer, L. Y. Visser, O. Tse, S. J. J. M. F. Kokkelmans

Institution: Eindhoven University of Technology

Language: English

Topic: Quantum Computing Algorithms and Architecture

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funders: Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Ministerie van Economische Zaken en Klimaat, HORIZON EUROPE Framework Programme

Awards: G1224407097, G220517111, Variational Quantum Optimal Control on Rydberg-atom quantum processors, G7075332745, Atomic quantum simulators 2.0 - taming the long-range interactions