Fast optical control of a coded qubit in a triple quantum dot
| Autor: | Omar Osenda, Sergio S. Gomez, Alejandro Ferrón, Diego S. Acosta Coden, Rodolfo H. Romero |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
OPTIMAL CONTROL THEORY
Field (physics) Ciencias Físicas FOS: Physical sciences Electronic structure QUANTUM DOTS Discrete dipole approximation 01 natural sciences 010305 fluids & plasmas purl.org/becyt/ford/1 [https] Quantum mechanics 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 010306 general physics Mathematical Physics Physics Condensed Matter - Mesoscale and Nanoscale Physics purl.org/becyt/ford/1.3 [https] Configuration interaction Nanosecond Condensed Matter Physics Atomic and Molecular Physics and Optics Quantum dot Qubit Excited state CIENCIAS NATURALES Y EXACTAS QUANTUM CONTROL Física de los Materiales Condensados |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| Popis: | In this work, we study strategies for the optical control, within the dipole approximation, of a qubit encoded in the three-electron states of a triple quantum dot. The system is described by effective confining potentials, and its electronic structure by the configuration interaction method. Optimal control theory (OCT) was applied to design low-fluence time-dependent electric fields controlling the qubit in times shorter than a nanosecond. The resulting pulses produce transitions between the qubit states for experimentally available field amplitudes with high fidelity. Their frequency spectra are related to transitions to some lower-lying excited states and a simplified pulse based on those sequential transitions is presented. The limitations of an extended Hubbard description for the type of strategy analyzed here are also discussed. 10 pages, 5 figures, regular paper |
| Databáze: | OpenAIRE |
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