Article ID Journal Published Year Pages File Type
1546248 Physica E: Low-dimensional Systems and Nanostructures 2008 6 Pages PDF
Abstract

In this paper we study the decoherence and purity of a driven solid-state qubit in the Ohmic bath by using the method based on the master equation. At first, instead of solving the master equation we investigate the coefficients of the equation which describe the shift in frequency, diffusive, decoherence, and so on. It is shown that one of the coefficients (we called it decoherence coefficient) is crucial to the decoherence of the qubit in the model. Then we investigate the evolution of the purity of the state in the model. From the analysis of the purity we see that the decoherence time of the qubit decreases with the increase in the amplitude of the driven fields and it increases with the increase in the frequency of the driven fields.

Related Topics
Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
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