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Spin Resonance in Perspective of Floquet Theory and Brillouin-Wigner Perturbation Method (2407.01075v1)

Published 1 Jul 2024 in quant-ph

Abstract: We studied the two-level spin resonance in a new perspective. Using the Floquet theory, the periodic interaction Hamiltonians were transfromed into a time-independent interaction. Using the Brillouin-Wigner perturbation method, a degenerated subspace is constructed, where the effective Hamiltonian is given in a perturbation expansion. In this framework, we found that the upper triangular element $\langle \alpha | H1 | \beta \rangle$, determines whether the resonance happens. The generalized Rabi frequency and the Bloch-Siegert shift were solved straightforwardly as the first order and the second order solution, proving the benefit of the developed method.

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