Qubit interference at avoided crossings: The role of driving shape and bath coupling
arXiv:1409.5237 · doi:10.1103/PhysRevA.91.042109
Abstract
We derive the structure of the Landau-Zener-Stückelberg-Majorana (LZSM) interference pattern for a qubit that experiences quantum dissipation and is additionally subjected to time-periodic but otherwise general driving. A spin-boson Hamiltonian serves as model which we treat with a Bloch-Redfield master equation in Floquet basis. It predicts a peak structure that depends sensitively on the operator through which the qubit couples to the bath. The Fourier transforms of the LZSM patterns exhibit arc structures which reflect the shape of the driving. These features are captured by an effective time-independent Bloch equation which provides an analytical solution. Moreover, we determine the decay of these arcs as a function of dissipation strength and temperature.
arXiv comment10 pages, 6 figures, submitted to PRA
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- Dynamical symmetries of periodically-driven quantum systems and their spectroscopic signatures
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