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arXiv:0802.3025

Linearized Feedforward Control of Two-Level Quantum System by Modulated External Field

Sergey Borisenok, Saifullah

Published Feb 21, 2008• 0 citations
arXivHTMLPDF

Abstract

We propose a model of feedforward (open-loop) optical control of two-level atom in the linearized form. This model allows to express the general form of solution for the atomic level populations via the arbitrary shapes of the control signal. Then we make numerical investigations of different shapes for the optical control signal.
DOI
10.48550/arxiv.0802.3025

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Expressions for polarization and population difference of a quantum system in the modulated optical field at the modulation frequency exceeding the transition line width have been obtained in the form of the Fourier series. The characteristic frequency of the system, or the Rabi frequency, has been determined numerically. It depends not only on the intensity of the carrier wave and the detuning magnitude but also on depth and frequency of modulation. The computational technique is applicable both for amplitude and phase modulation.
Abstract We propose a model for optical switching in a closed-loop three-level lambda atomic system excited by two optical fields, coupling and probe lights, and by a microwave-driven field. A set of coupled Maxwell–Bloch equations for the atom-field system is numerically solved with a combination of the Runge–Kutta and finite difference techniques. It is shown that the transmitted probe light can be switched to a nearly square pulse train by switching the relative phase of the interacting fields or by switching the intensity of the microwave field. Furthermore, the switching mode between the probe field and relative phase can be anti-synchronous or synchronous, depending on the relative phase being modulated to π /2 and 3 π /2 or π and 2 π , respectively. Also, the efficiency and the switching rate can be controlled by the microwave field, the relative phase and the intensity of the coupling field. Such a controllable optical switching model can be applied in the design of optical switching and amplification devices working at low light intensities.