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- W2023956973 abstract "We describe a method suitable for the design of broadband propagators in two-level or pseudo-two-level systems via amplitude-modulated irradiation. Irradiation sequences are described in terms of a Fourier expansion. The Fourier coefficients of the expansion are used to calculate the time-independent Floquet Hamiltonian which represents the time-dependent Hamiltonian. This transformation removes the difficulty of integrating the time-dependent equations of motion. The infinite Floquet matrix is approximately diagonalized by an application of perturbation theory. A set of infinite matrix operators is introduced which assists in the diagonalization. The perturbation-theory expressions are used to derive approximate expressions for the propagator. Successive terms in the perturbation expansion can be nulled by considering additional Fourier coefficients. Broadband-irradiation sequences with low mean power or low peak power are described corresponding to coherent excitation in two-level systems through the flip angles 45ifmmode^circelsetextdegreefi{}, 90ifmmode^circelsetextdegreefi{}, 135ifmmode^circelsetextdegreefi{}, and 180ifmmode^circelsetextdegreefi{}." @default.
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- W2023956973 date "1989-06-01" @default.
- W2023956973 modified "2023-09-26" @default.
- W2023956973 title "Design of broadband propagators in two-level systems" @default.
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- W2023956973 doi "https://doi.org/10.1103/physreva.39.5725" @default.
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