Alejandro Ferron, Daniel Dominguez, Maria Jose Sanchez
We distinguish different mechanisms for population inversion in flux qubits
driven by dc+ac magnetic fields. We show that for driving amplitudes such that
there are Landau-Zener-St\"uckelberg intereferences, it is possible to have
population inversion solely mediated by the environmental bath at long driving
times. We study the effect of the resonant frequency $\Omega_p$ of the
measuring circuit, finding different regimes for the asymptotic population of
the state of the flux qubit. By tailoring $\Omega_p$ the degree of population
inversion can be controlled. Our studies are based on realistic simulations of
the device for the Josephson flux qubit using the Floquet-Born-Markov
formalism.
View original:
http://arxiv.org/abs/1202.5445
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