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5 papers · 2 filters
Action scales for quantum decoherence and their relation to structures in phase space
Daniel Alonso, S. Brouard, Jose P. Palao +1
A characteristic action is defined whose magnitude determines some properties of the expectation value of a general quantum displacement operator. These properties are related…
Optimal control theory for unitary transformations
Jose P. Palao, R. Kosloff
The dynamics of a quantum system driven by an external field is well described by a unitary transformation generated by a time dependent Hamiltonian. The inverse problem of finding…
Weak-Coupling-Like Time Evolution of Driven Four-Level Systems in the Strong-Coupling Regime
Vicente Delgado, J. M. Gomez Llorente
It is shown analytically that there exists a natural basis in terms of which the nonperturbative time evolution of an important class of driven four-level systems in the strong-cou…
Nonperturbative Coherent Population Trapping: An Analytic Model
V. Delgado, J. M. Gomez Llorente
Coherent population trapping is shown to occur in a driven symmetric double-well potential in the strong-field regime. The system parameters have been chosen to reproduce the $0^{-…
Explicit solution for a Gaussian wave packet impinging on a square barrier
A. L. Perez Prieto, S. Brouard, J. G. Muga
The collision of a quantum Gaussian wave packet with a square barrier is solved explicitly in terms of known functions. The obtained formula is suitable for performing fast calcula…