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Optimal control of quantum rings by terahertz laser pulses

AuthorsRäsänen, E.; Castro, Alberto; Werschnik, J.; Rubio, Angel; Gross, E. K. U.
Issue DateApr-2007
PublisherAmerican Physical Society
CitationPhysical Review Letters 98: 157404 (2007)
AbstractComplete control of single-electron states in a two-dimensional semiconductor quantum-ring model is established, opening a path into coherent laser-driven single-gate qubits. The control scheme is developed in the framework of optimal-control theory for laser pulses of two-component polarization. In terms of pulse lengths and target-state occupations, the scheme is shown to be superior to conventional control methods that exploit Rabi oscillations generated by uniform circularly polarized pulses. Current-carrying states in a quantum ring can be used to manipulate a two-level subsystem at the ring center. Combining our results, we propose a realistic approach to construct a laser-driven single-gate qubit that has switching times in the terahertz regime.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.98.157404
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